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Long Range Hunting & Shooting
Throat burned out or not???
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<blockquote data-quote="MagnumManiac" data-source="post: 1530052" data-attributes="member: 10755"><p>I have not read every post, but here goes.</p><p>Japanese made Mark 5's had slow for calibre twists. I would be 100% sure your rifle has a 1:12" twist, which is why it shoots poorly with 175's.</p><p>Checking the twist is easy enough with a cleaning rod if the handle spins freely.</p><p></p><p>The other thing is the free bore.</p><p>I have quite a few Weatherby chamberings, all but one have a .375" freebore. My 375 Weatherby has the original .500" freebore and gets impressive velocities for a 24" barrel.</p><p>I DO NOT try to reach the rifling, I work with mag length and tune from there.</p><p></p><p>There is accuracy in there somewhere, just try different seating depths and don't worry about how far the bullets are jumping and try a 160gr and see if it shoots then better.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1530052, member: 10755"] I have not read every post, but here goes. Japanese made Mark 5’s had slow for calibre twists. I would be 100% sure your rifle has a 1:12” twist, which is why it shoots poorly with 175’s. Checking the twist is easy enough with a cleaning rod if the handle spins freely. The other thing is the free bore. I have quite a few Weatherby chamberings, all but one have a .375” freebore. My 375 Weatherby has the original .500” freebore and gets impressive velocities for a 24” barrel. I DO NOT try to reach the rifling, I work with mag length and tune from there. There is accuracy in there somewhere, just try different seating depths and don’t worry about how far the bullets are jumping and try a 160gr and see if it shoots then better. Cheers. [/QUOTE]
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Throat burned out or not???
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