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Rifles, Reloading, Optics, Equipment
Reloading
Freebore and OACL Question and Help
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<blockquote data-quote="MagnumManiac" data-source="post: 900885" data-attributes="member: 10755"><p>Generally, there will be 2 OAL that produce the best accuracy, one real close to the rifling and another much further away, .200"+ is not unheard of.</p><p>I have a few rifles with throats longer than what I would call ideal, but I get very good accuracy out of them even with the longer throats. What I do is load to the max magazine length with 5 rounds, shoot a group and see if it shoots, if it's not up to par, I load 5 round batches with decreasing OAL's by .005" increments, not going too short within reason, I stop at .050" less if nothing changes and go back to .010" short of max mag length. This has only happened to me with one bullet type, all others have had some improvement within the .050" limit I set.</p><p>In fact, I have one rifle with a very long throat, due to it being a Weatherby chambering, and it is very, very accurate, one hole groups @ 200yrds are common................... and it's a 375Weatherby! Not noted as being a tack driving cartridge but mine is, it's a Winchester Model 70 Classic Stainless circa early/mid '90's rechambered and hand lapped in a HS Precision stock, 300yrd shots are easy with this rifle, I'm still flabbergasted by it's accuracy.</p><p></p><p>So, I wouldn't worry too much by how much the bullet jumps, just tweak your seating depthnuntil you come up with an accurate OAL, after all it's the barrel whip that you're tuning, not the jump.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 900885, member: 10755"] Generally, there will be 2 OAL that produce the best accuracy, one real close to the rifling and another much further away, .200"+ is not unheard of. I have a few rifles with throats longer than what I would call ideal, but I get very good accuracy out of them even with the longer throats. What I do is load to the max magazine length with 5 rounds, shoot a group and see if it shoots, if it's not up to par, I load 5 round batches with decreasing OAL's by .005" increments, not going too short within reason, I stop at .050" less if nothing changes and go back to .010" short of max mag length. This has only happened to me with one bullet type, all others have had some improvement within the .050" limit I set. In fact, I have one rifle with a very long throat, due to it being a Weatherby chambering, and it is very, very accurate, one hole groups @ 200yrds are common................... and it's a 375Weatherby! Not noted as being a tack driving cartridge but mine is, it's a Winchester Model 70 Classic Stainless circa early/mid '90's rechambered and hand lapped in a HS Precision stock, 300yrd shots are easy with this rifle, I'm still flabbergasted by it's accuracy. So, I wouldn't worry too much by how much the bullet jumps, just tweak your seating depthnuntil you come up with an accurate OAL, after all it's the barrel whip that you're tuning, not the jump. Cheers. gun) [/QUOTE]
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