I generally limit a range session with a new rifle to one box of ammunition (20 rounds) and I wait to clean the rifle until I have returned home. Thats just not my standard. They are faster and deliver more energy downrange at the cost of longer actions, more recoil and blast—and reduced barrel life. .308 Winchester = 1 in 12" It takes less twist to stabilize a given bullet at high velocity than at low velocity. Their weight (within reason) makes it easier to hold the rifle steady. ), which achieve muzzle velocities around 3000 fps, are at their best in a 24 inch barrel and 24 inches is the SAAMI standard for almost all American centerfire rifle calibers. (Marlin and Ruger rifles) = 1 in 20" = 1 in 10" Heat is bad for barrels, so letting a barrel cool between shots extends barrel life. Mag. An occasional shooter may still enjoy years of successful shooting beyond this point, however precision will gradually decline, until eventually reaching a point where precision and accuracy is no longer satisfactory. Fortunately, the rate of twist chosen by the rifle maker is usually appropriate for the intended cartridge. .416 Rem. to .338-378 Wby. (For a more comprehensive list, see "Common Rifle Barrel Twist Rates" on the Rifle Information Page. The usual twist rates for some of the more popular rifle calibers are given below. barrels are rifled with a 1 in 12 inches twist, some .30-06 barrels are also rifled 1 turn in 12 inches, and some .300 Magnum barrels are rifled 1 turn in 14 inches. Seems like that would extend barrel life considerably. This is called spin stabilizing, and works because of gyroscopic forces acting on the spinning bullet during flight. One such case involved the .244 Remington. Cut a magnum's barrel down to 22 inches and the muzzle blast and flash become intimidating. The last one, installed by Sam May, Apex Rifle Co. Flagstaff, only got to about 750 rds. SAUM = 1 in 9.25" The higher the pressure and velocity of a cartridge (pressure and velocity usually increase together), the more powder a cartridge burns and the smaller the bore through which the burning powder is forced, the faster it will wear out a barrel. Even .22 rimfire rifles balance better with 20-22 inch barrels, although in this instance the longer barrel has no ballistic advantage, since the .22 LR cartridge burns all of of its powder in about 16 inches. The Lyman table shows the following approximate velocity changes: For rifles with muzzle velocities in the 1000-2000 fps range, the change in velocity for each 1" change in barrel length is 5 fps. Add to Cart for Price SHIPS FREE Orders must have $49 of Free Shipping products to qualify for shipping discount. it has a generic synthetic stock. Manufacturers generally use more erosion resistant steel in barrels for high intensity cartridges and barrels for magnum cartridges are often made of very hard stainless steel. With very high velocity cartridges, such as the .257 Weatherby Magnum, I let the barrel cool down after every shot. Great deals on 270 Barrel. 7mm Rem. For rifles with muzzle velocities in the 3001-3500 fps range, the change in velocity for each 1" change in barrel length is 30 fps. As erosion occurs more powder gas blows past the bullet before it can seal the bore. The rifle will be used for Elk and Oryx, if a permit can be drawn. Is it possible you're barrel was a dud? Mark V Accumark rifles are supplied with #3 barrels in all available calibers, which range from .240 Wby. = 1 in 12" For example, some .270 Win. It is worth noting that the velocity figures published in ammunition brochures and reloading manuals are sometimes taken in barrels different in length from those supplied on many rifles. The Remington Catalog 2003 includes a "Centerfire Rifle Velocity Vs. Barrel Length" table that shows the following velocity changes for barrels shorter or longer than the test barrel length: MV 2000-2500 fps, the approximate change in MV per 1" change in barrel length is 10 fps. MV 3500-4000 fps, the approximate change in MV per 1" change in barrel length is 40 fps. There are various ways to rifle a barrel. The highest velocity standard cartridges (.243, .25-06, .270 Win. OTOH, I have shot out 2 - 25-06 barrels. .338 Win. The .270 Win., shown to the right of a .30-'06 Sprg. It may not display this or other websites correctly. Harder steels are more difficult to work and raise manufacturing costs (and thus retail prices) which, of course, is not desirable. The outside of the barrel is then "hammer forged" (or beaten) to impress the rifling into the bore. For rifles with muzzle velocities in the 3501-4000 fps range, the change in velocity for each 1" change in barrel length is 40 fps. By David E. Petzal and Phil Bourjaily. These cartridges kill by bullet weight and diameter and retain enough velocity from a 20 inch barrel for medium range shooting. Examples:.22 PPC, 6 PPC and .308 Win., about 3000 rounds..30-06, about 2500 rounds..243 Win, about 1500 rounds. It still shoots good - with some loads the groups open a little, but it is a fairly consistent 1 1/2" rifle. Some barrels, called "bull barrels" are not tapered at all. Mag., which typically operate at 2500-2800 fps, the velocity loss in a 22 inch barrel … Jack O'Connor wrote in The Rifle Book that, "The barrel shorter than standard has a velocity loss which averages about 25 foot-seconds for every inch cut off the barrel. Barrels for most cartridges above .30 caliber are rifled with six grooves, as are .22 rimfire barrels. You must log in or register to reply here. = 1 in 14" .450 Marlin = 1 in 20" .270 Winchester = 1 in 10" The length of the rifle barrel has a direct influence on the velocity obtained from the cartridge for which it is chambered. The heaviest spitzer bullet that a .244 with a 1:12 twist barrel could stabilize was 90 grains. These short rifles ride well in a saddle scabbard, are easy to carry in rugged terrain and handle fast in close quarters. When first introduced, barrels for this caliber were made with a 1:12 inch twist, because Remington anticipated that their new cartridge would be used primarily for varmint shooting. The following year they reintroduced the exact same cartridge as the 6mm Remington and produced 6mm rifle barrels with 1:9 twist barrels, which can stabilize all .24/6mm bullets. Tapered barrels are greater in diameter at the chamber than at the muzzle, because when a cartridge is fired, the pressure is highest at the chamber end. with the Hogue stock. However, for cartridges such as the 6.5x55, 7x57mm, .308 Win., .30-06, .338 Federal, .35 Whelen and .350 Rem. I think that claims of barrel life, especially those claiming such high numbers as 4000 rounds need to be qualified. Shaw, for example, numbers their barrels thusly: #1 Light Sporter, #1-1/2 Magnum Sporter, #2-1/2 Heavy Sporter, #3 Light Varmint, #3-1/2 Heavy Varmint, #4 Bull Barrel, #5 Heavy Bull. However, for cartridges such as the 6.5x55, 7x57mm, .308 Win., .30-06, .338 Federal, .35 Whelen and .350 Rem. ), which achieve muzzle velocities around 3000 fps, are at their best in a 24 inch barrel and 24 inches is the SAAMI standard for almost all American centerfire rifle calibers. A more modern method is to pull a gang of broaches through the barrel, which cuts the all the grooves into the bore simultaneously. 26 inch barrels are usually found on rifles chambered for high velocity magnum cartridges. Combine a high intensity cartridge with a 20 inch barrel and the velocity drops sharply, while the muzzle blast becomes annoying. .300 Wby. Where The Damage Is Done . .270 WSM = 1 in 10" A fast twist increases pressure and also the strain on the bullet jacket. Anyone ordering a new barrel for a rifle will generally do well to specify the standard twist, as supplied by the major rifle manufacturers for that caliber. The answer is no. For a better experience, please enable JavaScript in your browser before proceeding. (sometimes even a .22LR on the 100yd range!) Defining barrel life as a degradation of .5MOA precision, I would expect the barrel life to be a lot closer to 1000 then 4000, probably around 1500 rounds depending on the factors of heat, velocity, cleaning, etc......not much different from any other +3000FPS cartridge capable of taking game effectively at long range. The old way was to cut the rifling one groove at a time on a rifling machine. American rifle barrels traditionally spin bullets to the right, but British barrels spin them to the left. It's barrel life likely no different from a 270 or 7Mag, were they used under the same conditions. = 1 in 10" .300 Win. Once in a great while, though, a manufacturer makes a mistake. Rifle barrels are usually made from steel alloys called ordnance steel, nickel steel, ... For example, some .270 Win. Likewise, there is a velocity gain with a longer barrel." The longest barrels usually seen on hunting rifles today are 26 inches in length. If your barrel loses accuracy at the 1500-round mark, then it only worked for three seconds! roughly how many rounds would a barrel last and whether the weatherby magnum cartridge caused significantly more throat errosion than a 270 win or the 270 wsm, also any ways to extend barrel life or minimise erosion. If your experience is common I wonder Why the .270 isn't more well known as a barrel burner? The consumer has to rely on the manufacturer's judgment in this area. .303 British = 1 in 10" cartridge (l.), was created by necking down the .30-'06 case to accept a .277" bullet. A long barrel is required to burn the large amounts of slow burning powder used in this type of cartridge. I have owned big game rifles with 18-1/2 inch barrels and in every case I wished they had come with at least a 20 inch barrel. A lighter rifle is easier to carry long distances and faster to get into action. Ballistically, for centerfire calibers, longer is usually better. 308's that I used for competition. .243 Winchester = 1 in 10" was wondering if anyone had any experience with this calibre chambered in a weatherby rifle and whether this cartridge was hard on the barrel. Discussion in 'Rifle Country' started by WestKentucky, Jan 29, 2019. Erosion from bullet friction alone is minimal as suggested by the longer barrel life of “mild” cartridges like 30-30 Winchester, 22 Hornet, and especially 22 rimfire. It starts as a steel bar, which is then drilled and reamed to the "bore diameter" of the cartridge for which it is to be chambered. If your idea of accurate barrel life is +2 moa then you may get 4000 rounds. i.e. I have seen various estimates of how much velocity is lost (or gained) when a barrel is not the same length as the test barrel in which a cartridge was chronographed. However, their muzzle blast is considerable. Heavier bullets require faster twist rates than lighter bullets of the same caliber and shape. Very short barrels also increase the muzzle blast from high intensity cartridges to very annoying levels and the velocity loss is excessive. For rifles with muzzle velocities in the 2001-2500 fps range, the change in velocity for each 1" change in barrel length is 10 fps. Very short barrels of standard contour (not bull barrels) tend to make the rifle muzzle light and unsteady to hold and swing. 270 weatherby magnum barrel life? Very long 27-30 inch barrels are seldom seen these days on repeating hunting rifles, although they are still occasionally found on single shot hunting rifles and target rifles. That's not much. Fast & Free shipping on many items! However, the customers also wanted to use their new .24 caliber rifles for hunting medium size game (deer and pronghorn), using 100 grain bullets. That indeed was a factory CM hammer forged barrel, using a bore guide, one piece coated cleaning rod, no ammonia cleaners, cleaned properly around every 70 to 100 rounds. .30-30 Winchester = 1 in 12" I have also read that relative to others similar to the .270 Win, this cartridge is not too tough on barrel life. Barrel wear is due to erosion from the extreme heat and pressure caused by firing a cartridge. In the December 1943 issue of Outdoor Life, he wrote, “Assuming that a cartridge can make its way on merit alone, that cartridge is the .270 W.C.F. When I take my 300wby to the range, I always take at least one or two other rifles with me as well. Thread Status: Not open for further replies. One thing that I've also heard mixed reports on is .270 Win barrel life, some guys (including gunsmith) say that it is as low as 1000 rounds before accuracy falls off noticeably and others suggest up to around 4000. Sales remained so slow that eventually Remington had to discontinue the .244. However, for carrying, handling and maneuvering in close quarters (like thick brush, or getting in and out of vehicles), shorter is usually better. Usually these variations make no great difference. Mag. Of course, if you are shooting a “long-lived” .308 Win that goes 5000 rounds before losing accuracy, then you get a whopping TEN seconds of barrel life. However, a longer barrel is generally better in terms of practical accuracy, because a longer and therefore heavier barrel of a given contour (within reason) is easier to hold relatively steady from unsupported positions; thus it is easier to shoot a long barreled rifle accurately. Especially when considering the difference in velocity and amount of powder used in each round. .22 Long Rifle = 1 in 16" The arms makers try to select a barrel contour that complements the caliber and purpose for which the rifle is intended. Their figures apply to barrels between 20 and 26 inches in length and agree with the Remington figures. The .220 Swift requires a tougher barrel than a .223 Remington, which requires a tougher barrel than a .22 Hornet, which requires a tougher barrel than a .22 LR. Rifle barrels are often described as heavy (varmint/target), medium (sporter), or light. 6.5x54 M-S = 1 in 7.9" 1100? I do typically wait at least 1 minute between shots or up to 5 mins if the barrel is too hot to hold. Rifles have been rifled with from two to eight fairly deep grooves. Other authorities have tried to take into account the different velocity ranges within which modern cartridges operate. April 21, 2006 . The average loss for the .300 H&H Mag./220 grain bullet was 25 fps per inch. Mag./140 grain bullet was 32 fps per inch. I also use a bore guide to clean my .270 with a one piece rod. These are useful all-around barrel lengths for such cartridges. Thread starter RkyMtnELK; Start date Aug 24, 2017; Aug 24, 2017 #1 R. RkyMtnELK Member. If it starts out at about 1/2 MOA, then the barrel may well last twice as long; 3000 rounds. To my mind it is hard to justify barrels shorter than 20 inches for big game hunting. The stubby barrel is less likely than longer tubes to get hung up on branches, overhangs and so forth. 6mm Remington = 1 in 9" .257 Wby. In Weatherby Mark V Deluxe model rifles, for example, standard calibers are supplied with #1 contour barrels, magnum calibers from .257 Wby. However, I doubt the original 130-grain factory load attained its advertised velocity, especially in the Model 54’s 24-inch barrel, though it probably did get around 3,000 fps. For example, I have read that, according to Hornady technicians, the accurate barrel life of a 6.5mm PRC rifle (143 grain bullet at 2960 fps; MAP 65,000 psi) is about half that of a 6.5mm Creedmoor rifle (143 grain bullet at 2700 fps; MAP 62,000 psi)--about 1500 rounds versus 3000 rounds! comes with a #4 barrel. The idea that there is some special "break-in" or cleaning routine required for new rifle barrels has gotten a lot of attention recently. It's funny, but that is what I had suspected all along! Mag., which typically operate at 2500-2800 fps, the velocity loss in a 22 inch barrel is not extreme and a rifle with a barrel of this length usually balances and swings well. Shilen Barrel Blank 270 Caliber Centerfire Product Family #: 1554117668; Product #: Manufacturer #: UPC #: Loading image... Our price $229.99 through $349.99 0 at this price. Mag. The average loss for the .30-06/180 grain bullet was 15 fps per inch. Mountain rifles, for example, traditionally have short, light barrels. JavaScript is disabled. At the same velocity in the same caliber, longer (pointed) bullets require faster twist rates than shorter (round nose) bullets of the same weight. So assuming I am not decreasing barrel life with bad habits, do you have a specific ballpark number? 1 in 10 inches, or 1:10), is designed to stabilize the range of bullets normally used in a particular caliber to a distance beyond the practical range of the cartridge. For rifles with muzzle velocities in the 2501-3000 fps range, the change in velocity for each 1" change in barrel length is 20 fps. Mag. .444 Marlin = 1 in 38" Revolver cartridges adapted to rifle actions can, of course, be fired from barrels at the legal minimum length and still show large velocity gains compared to the same cartridges fired from typical 4" to 8" revolver barrels. All rights reserved. We at Outdoor Life take special pride in the ongoing success of the .270 because it was on these pages, through the romantic phrases and sound advice of Jack O'Connor, that the .270 became a hunting icon. .25-06 Remington = 1 in 10" Big capacity, small bore cartridges operating at very high pressure, such as the 6.5mm PRC, .26 Nosler and .30-378 Weatherby, are notorious barrel burners. and instead purchased .243 Winchester rifles. This refers to the thickness of the steel surrounding the bore. My 1980 .270 Win. roughly how many rounds would a barrel last and whether the weatherby magnum cartridge caused significantly more throat errosion than a 270 win or the 270 wsm, also any ways to extend barrel life or minimise erosion. Needless to say, customers ignored the new .244 Rem. come with #3 barrels and the .460 Wby. The secret to barrel life is not to keep shooting with a hot barrel. The medium weight sporter barrel (#2 in some brands) is an attempt to find a reasonable compromise between portability and performance. MV 3000-3500 fps, the approximate change in MV per 1" change in barrel length is 30 fps. I expect to see 10-15 years of life for how I use it. Rifle barrels are usually made from steel alloys called ordnance steel, nickel steel, chrome-molybdenum steel, or stainless steel, depending upon the requirements of the cartridge for which they are chambered. If the maker of your rifle barrel prescribes a specific break-in routine, it is probably best to follow their instructions. = 1 in 16" OTOH, I have shot out 2 - 25-06 barrels. Perhaps, not running so hot, or, a 1 MOA standard would give longer barrel life.The standards for defining barrel life really needs to be understood to have much relevance for a given use. falls victim to the twist rate of the common barrels, much like the .22-250 and .220 Swift. Some custom barrel makers use numbers to indicate barrel contour/weight. Joined Jul 23, 2015 Messages 47 Location New Mexico. .350 Rem. Erosion gradually moves down the bore with use and can be seen with the naked eye as it becomes more severe. You are using an out of date browser. Velocity loss is still considerable, however, usually 150-200 fps. = 1 in 10" .223 Remington = 1 in 12" My advice is to follow the suggestions of the barrel manufacturer. Thoughts of others on this cartidge’s wear on barrels and if that is a quality worthy of the discussion. Cartridges with smaller cases that operate at lower velocity, such as the .30-30, .32 Special, .35 Rem., .38-55 and similar numbers, do reasonably well in 20 inch barrels. The distance across the grooves is called the "groove diameter." Heavy barrels take longer to heat-up, thus maintaining good accuracy for more shots. The standard 22" sporters which dominated the market place during the 1980’s and 1990’s will normally achieve 3100fps, 3000fps and 2900fps respectively. I try not to shoot the 300 more than a couple shots in a row before setting it back in the rack with the action open to cool while shooting something else. The long barrel seems to hang up on every limb and outcropping of rock in the area and a hunting rifle so equipped can be very awkward carry in steep terrain. .30 Carbine = 1 in 16" E.R. The typical barrel length for a repeating hunting rifle chambered for high intensity cartridges, such as the .243, .260, .270, 7mm-08, .308, or .30-06, is 22-24 inches. The rifling grooves are then cut into the bore. He went on to illustrate this using a .30-06 rifle shooting 180 grain bullets as an example, so his estimate was obviously for rifles in that general performance class. Is barrel wear and barrel life a serious concern for 99% of readers? This lightens the barrel by removing excess metal.

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