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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Freebore in a hunting rifle.
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<blockquote data-quote="J E Custom" data-source="post: 503420" data-attributes="member: 2736"><p>There are several things that I would recommend for you Application/Need.</p><p></p><p>I would set the chamber back just enough to clean it up with a new reamer with these dimensions.</p><p></p><p>3/16 to 1/4" freebore, the freebore should be bullet diameter(NO More),The big issue for accuracy </p><p>is head space in a chamber with Lot's of freebore (On belted cases I head space .0005 to .001 max,</p><p>And on shouldered cases .000 to .0005 max) On the shouldered cases the bolts camming action will</p><p>compress enough to close the bolt with no movement of the case during firing.</p><p></p><p>I do not recommend this to an inexperienced re loader or if factory ammo is to be used, because of</p><p>inconsistencies.</p><p></p><p>The other option is to fire form and neck size only 90% of the neck.</p><p></p><p>To also reduce the pressure have the reamer cut to allow the neck to expand .002 to .003</p><p>thousandths more than loaded rounds. Or turn the necks down for the same clearance.</p><p></p><p>The tight head space and 10% of the neck that was not re sized will align the cartridge perfectly</p><p>for greater accuracy and the freebore will allow for larger powder charges with no more pressure.</p><p></p><p>I have my 30/378 Weatherby setup this way and using 126 grs of 50 BMG and a 200 grain partition</p><p>velocity is off the charts, and case extraction is easy with no signs of pressure. The best 5 shot</p><p>group to date at 100 yards has been .092 (Less than 1/10 of an inch).</p><p></p><p>And all of this with a belted case, and lots of freebore And a Mark 5 Weatherby action.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 503420, member: 2736"] There are several things that I would recommend for you Application/Need. I would set the chamber back just enough to clean it up with a new reamer with these dimensions. 3/16 to 1/4" freebore, the freebore should be bullet diameter(NO More),The big issue for accuracy is head space in a chamber with Lot's of freebore (On belted cases I head space .0005 to .001 max, And on shouldered cases .000 to .0005 max) On the shouldered cases the bolts camming action will compress enough to close the bolt with no movement of the case during firing. I do not recommend this to an inexperienced re loader or if factory ammo is to be used, because of inconsistencies. The other option is to fire form and neck size only 90% of the neck. To also reduce the pressure have the reamer cut to allow the neck to expand .002 to .003 thousandths more than loaded rounds. Or turn the necks down for the same clearance. The tight head space and 10% of the neck that was not re sized will align the cartridge perfectly for greater accuracy and the freebore will allow for larger powder charges with no more pressure. I have my 30/378 Weatherby setup this way and using 126 grs of 50 BMG and a 200 grain partition velocity is off the charts, and case extraction is easy with no signs of pressure. The best 5 shot group to date at 100 yards has been .092 (Less than 1/10 of an inch). And all of this with a belted case, and lots of freebore And a Mark 5 Weatherby action. J E CUSTOM [/QUOTE]
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Freebore in a hunting rifle.
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