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Hunting
Long Range Hunting & Shooting
6.5 lrm Need help on neck turing.
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<blockquote data-quote="AZShooter" data-source="post: 1032889" data-attributes="member: 5219"><p>Certain he meant total which is 2 1/2 thousands per side. I read on accurate shooter that some guys shooting the 284 win were having issues with too tight a bullet release dimension:</p><p></p><p>"Jerry Tierney, a past NBRSA 1000-yard champion and .284 Win "guru", has observed that overly tight chamber neck tolerances can cause accuracy problems. Jerry says "some guys who were running minimal neck clearance .284 chambers weren't getting the accuracy they expected. If you open up the neck to allow more clearance, say .0015-.002″ per side, that seems to solve the problems. I can't tell you exactly why–maybe it allows a 'cleaner' bullet release–but easing the neck clearance has helped many .284 shooters get better results."</p><p></p><p>To me that is still too tight for a hunting rifle. I agree with previous poster with a minimum of .0025" per side. Nothing wrong with .003-.004" per side either. </p><p></p><p></p><p>Just in case you didn't catch the trick to prevent donuts.... neck the 6.5 necks back to 7mm then turn the necks with the K and M turning tool so the angled cutter will remove a tiny bit from the shoulder.</p><p></p><p>I use my lathe in back gear for neck turning. I took apart an old lyman case trimmer and use the shell holder in my 3 jaw universal.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1032889, member: 5219"] Certain he meant total which is 2 1/2 thousands per side. I read on accurate shooter that some guys shooting the 284 win were having issues with too tight a bullet release dimension: "Jerry Tierney, a past NBRSA 1000-yard champion and .284 Win “guru”, has observed that overly tight chamber neck tolerances can cause accuracy problems. Jerry says “some guys who were running minimal neck clearance .284 chambers weren’t getting the accuracy they expected. If you open up the neck to allow more clearance, say .0015-.002″ per side, that seems to solve the problems. I can’t tell you exactly why–maybe it allows a ‘cleaner’ bullet release–but easing the neck clearance has helped many .284 shooters get better results.” To me that is still too tight for a hunting rifle. I agree with previous poster with a minimum of .0025" per side. Nothing wrong with .003-.004" per side either. Just in case you didn't catch the trick to prevent donuts.... neck the 6.5 necks back to 7mm then turn the necks with the K and M turning tool so the angled cutter will remove a tiny bit from the shoulder. I use my lathe in back gear for neck turning. I took apart an old lyman case trimmer and use the shell holder in my 3 jaw universal. [/QUOTE]
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6.5 lrm Need help on neck turing.
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