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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Re-chamber for 7RM Question...
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<blockquote data-quote="AZShooter" data-source="post: 1547989" data-attributes="member: 5219"><p>Crazyhorse,</p><p></p><p> While it is suggested by others Innovative it is also mentioned on Accurate Shooter website by Jerry Tierney: "Chambering can play a role as well. 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."</p><p></p><p>You are right when questioning such a small release clearance. You must turn the necks to be able to work with such a small amount. Even the best brass would have some neck thickness variance to cause release issues with accuracy or even worse pressure spikes.</p><p></p><p>You could specify a bit larger dimension of .0025" to .003"clearance. You will need to measure all your Winchester brass to ensure none are out of spec. You could skim turn the ones that are too thick.</p><p></p><p>IMO there is no need for a roughing reamer. You are not into production work, just a few chambers.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 1547989, member: 5219"] Crazyhorse, While it is suggested by others Innovative it is also mentioned on Accurate Shooter website by Jerry Tierney: "Chambering can play a role as well. 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." You are right when questioning such a small release clearance. You must turn the necks to be able to work with such a small amount. Even the best brass would have some neck thickness variance to cause release issues with accuracy or even worse pressure spikes. You could specify a bit larger dimension of .0025" to .003"clearance. You will need to measure all your Winchester brass to ensure none are out of spec. You could skim turn the ones that are too thick. IMO there is no need for a roughing reamer. You are not into production work, just a few chambers. [/QUOTE]
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Re-chamber for 7RM Question...
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