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Long Range Hunting & Shooting
Problem with shot consistancy 30-378
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<blockquote data-quote="J E Custom" data-source="post: 161014" data-attributes="member: 2736"><p><strong>30/378</strong></p><p></p><p>S.Ferg</p><p></p><p>The first 30/378 I had did about the same thing as your,s did</p><p>but no flyers with about a 1" group and factory loads.</p><p></p><p>So I decided to rebarrel and hold the headspace to .001 or less</p><p>so that freebore was not a problem.</p><p></p><p>I used a #7 tapered barrel 27.3/8" long and was very pleased .</p><p></p><p>The two best group,s were with a 120grs of H 50 BMG and a 180gr</p><p>blistic tip at 3431 ft/sec 5 shot group of .134 . </p><p>And 114grs of H 50 BMG and a 200gr noz partition at 3273ft/sec</p><p>and a 5 shot group of .092.</p><p></p><p>Over a period of a couple of years I came across a good weatherby</p><p>donor rifle for a future biuld and still having the factory barrel and</p><p>stock I decided to try and make another run at making the accumark</p><p>shoot.</p><p></p><p>So I put it all together and head spaced it to less than .001" and went </p><p>to the range , well the headspace helped to reduce group size to .654"</p><p>(not bad for a light barrel) but I wanted more so i tried an old trick for</p><p>heavy magnums with light barrels by installing a adjustable tip pressure</p><p>screw in the front sling swivel an "did it work" I was able to adjust the </p><p>group size down to .259" this using the factory barrel and chamber.</p><p></p><p>So before giving up you might try these things in this order.</p><p></p><p>Try H 50 BMG ( none of the loads with H 1000 or Retumbo worked for me).</p><p></p><p>Try different primers.</p><p></p><p>Try 200 gr bullets.</p><p></p><p>Try tip perssure (make sure barrel is floated) I know it sounds funny to </p><p>float the barrel and then apply tip pressure but this allow,s the barrel</p><p>to expand but will dampen the harmonics of the light barrel.</p><p></p><p>And dont shoot 5 shots back to back (this thing heats up after 2 or 3 shots</p><p>shoot,dry patch and wait 5 min then shoot and repeat process.</p><p></p><p>I hope this helps you save the rifle. </p><p>Please let me know how it work's</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 161014, member: 2736"] [b]30/378[/b] S.Ferg The first 30/378 I had did about the same thing as your,s did but no flyers with about a 1" group and factory loads. So I decided to rebarrel and hold the headspace to .001 or less so that freebore was not a problem. I used a #7 tapered barrel 27.3/8" long and was very pleased . The two best group,s were with a 120grs of H 50 BMG and a 180gr blistic tip at 3431 ft/sec 5 shot group of .134 . And 114grs of H 50 BMG and a 200gr noz partition at 3273ft/sec and a 5 shot group of .092. Over a period of a couple of years I came across a good weatherby donor rifle for a future biuld and still having the factory barrel and stock I decided to try and make another run at making the accumark shoot. So I put it all together and head spaced it to less than .001" and went to the range , well the headspace helped to reduce group size to .654" (not bad for a light barrel) but I wanted more so i tried an old trick for heavy magnums with light barrels by installing a adjustable tip pressure screw in the front sling swivel an "did it work" I was able to adjust the group size down to .259" this using the factory barrel and chamber. So before giving up you might try these things in this order. Try H 50 BMG ( none of the loads with H 1000 or Retumbo worked for me). Try different primers. Try 200 gr bullets. Try tip perssure (make sure barrel is floated) I know it sounds funny to float the barrel and then apply tip pressure but this allow,s the barrel to expand but will dampen the harmonics of the light barrel. And dont shoot 5 shots back to back (this thing heats up after 2 or 3 shots shoot,dry patch and wait 5 min then shoot and repeat process. I hope this helps you save the rifle. Please let me know how it work's J E CUSTOM [/QUOTE]
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