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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What kills barrel life on bigger magnums?
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<blockquote data-quote="Greyfox" data-source="post: 891752" data-attributes="member: 10291"><p>Without getting too scientific the numerous barrels that I have gone through appear to definitely be effected by heat typically caused by rate of fire. My competition rifles that are used in the summer months with strings as high as 30 shot strings at 30 second intervals have half the life of those shot with cooling allowed between shots. Life is measured by accuracy fall off , from .25-.5MOA to .5 to.75MOA. generally, my 308 competition rifles see this fall off at 2200-2400 rounds. Throats erode .060-.120" with a R5 Milpec barrel, that is generally cleaned every 150-200 rounds. Shooting magnums at +3000FPS and the 6.5x284, accuracy seems to fall off at 800-1200 rounds. The low end, or worse for the Weatherby, Short mags, and other overbore designs, high end for the 7mm-300 standards. This is with cooling allowed between shots. Generally, heavier, lower velocity bullets seem to give better barrel life out of the magnums than high velocity, lighter bullets. Barrel quality also pushes life to one end or the other of the range. I'm sure some see better or worse life than I do. Overall, I think barrel life is a function of case/cartridge design, powder charge, shooting style/heat, barrel quality and cleaning procedure. I do keep a round count for all my rifles but generally don't get too hung up on barrel life with hunting rifles if the rifle performs well. For competition rifles, I don't want to have to change a barrel or rifle in the middle of the season. IMO.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 891752, member: 10291"] Without getting too scientific the numerous barrels that I have gone through appear to definitely be effected by heat typically caused by rate of fire. My competition rifles that are used in the summer months with strings as high as 30 shot strings at 30 second intervals have half the life of those shot with cooling allowed between shots. Life is measured by accuracy fall off , from .25-.5MOA to .5 to.75MOA. generally, my 308 competition rifles see this fall off at 2200-2400 rounds. Throats erode .060-.120" with a R5 Milpec barrel, that is generally cleaned every 150-200 rounds. Shooting magnums at +3000FPS and the 6.5x284, accuracy seems to fall off at 800-1200 rounds. The low end, or worse for the Weatherby, Short mags, and other overbore designs, high end for the 7mm-300 standards. This is with cooling allowed between shots. Generally, heavier, lower velocity bullets seem to give better barrel life out of the magnums than high velocity, lighter bullets. Barrel quality also pushes life to one end or the other of the range. I'm sure some see better or worse life than I do. Overall, I think barrel life is a function of case/cartridge design, powder charge, shooting style/heat, barrel quality and cleaning procedure. I do keep a round count for all my rifles but generally don't get too hung up on barrel life with hunting rifles if the rifle performs well. For competition rifles, I don't want to have to change a barrel or rifle in the middle of the season. IMO. [/QUOTE]
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What kills barrel life on bigger magnums?
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