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Long Range Hunting & Shooting
When do you know you’re gonna rebarrel?
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<blockquote data-quote="Greyfox" data-source="post: 1528272" data-attributes="member: 10291"><p>How to know when to re-barrel? Whether the barrel is new or well used, the shooting precision(group size) is the primary indicator. Sometimes it's obvious, other times, not so much, as indicated by the periodic "flyer" from a barrel that otherwise shoots very tight groups. This is more difficult to confirm. In terms of used barrels that have performed well, it's easy if you simply wait for groups to deteriorate. This is not a good approach if it happens in the middle of the hunting/competition season. I have a few considerations to determine when to rebarrel "before" I get stuck.</p><p></p><p>-General(published) barrel life expectations for the particular cartridge, based in type of usage....ie. I know I should start checking my 6.5x284's at 1000-1200 rounds. My 6.5x47L at 2000 rounds....based on my particular applications.</p><p>-Once the barrel is broken in and stabilized with my load, I will keep a specific bullet(s) and record an accurate BTO measurement. This is used to keep track of any throat erosion. A .001-.003" increase, even if groups still look good is an good early indicator that the barrel is degrading.</p><p>-Using my Lyman Bore Scope(excellent investment that works!!), I will check bore condition. Watching for cleaning carbon/ copper in a routine basis helps barrel life. More importantly, fire cracking in the throat, mostly in the first 1/4" where the 'rifling" starts is one of the main culprits of flyers/poor groups...IMO.</p><p></p><p>While there are no sure fire methods, looking at a combination of the above factors has worked well for getting a barrel life expectation of my barrels/loads, and anticipating replacement INO.</p></blockquote><p></p>
[QUOTE="Greyfox, post: 1528272, member: 10291"] How to know when to re-barrel? Whether the barrel is new or well used, the shooting precision(group size) is the primary indicator. Sometimes it’s obvious, other times, not so much, as indicated by the periodic “flyer” from a barrel that otherwise shoots very tight groups. This is more difficult to confirm. In terms of used barrels that have performed well, it’s easy if you simply wait for groups to deteriorate. This is not a good approach if it happens in the middle of the hunting/competition season. I have a few considerations to determine when to rebarrel “before” I get stuck. -General(published) barrel life expectations for the particular cartridge, based in type of usage....ie. I know I should start checking my 6.5x284’s at 1000-1200 rounds. My 6.5x47L at 2000 rounds....based on my particular applications. -Once the barrel is broken in and stabilized with my load, I will keep a specific bullet(s) and record an accurate BTO measurement. This is used to keep track of any throat erosion. A .001-.003” increase, even if groups still look good is an good early indicator that the barrel is degrading. -Using my Lyman Bore Scope(excellent investment that works!!), I will check bore condition. Watching for cleaning carbon/ copper in a routine basis helps barrel life. More importantly, fire cracking in the throat, mostly in the first 1/4” where the ‘rifling” starts is one of the main culprits of flyers/poor groups...IMO. While there are no sure fire methods, looking at a combination of the above factors has worked well for getting a barrel life expectation of my barrels/loads, and anticipating replacement INO. [/QUOTE]
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When do you know you’re gonna rebarrel?
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