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Rifles, Reloading, Optics, Equipment
Gunsmithing
Reamer recs for 7mm rem mag
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<blockquote data-quote="keithcandler" data-source="post: 1806086" data-attributes="member: 3728"><p>I am running .115 with the 180's at 3050 with R#26 and 215's in Rem brass shooting tiny groups, 9.25" Twist, Rem SS Sendero.</p><p></p><p>If I were to go with IMR 8133, perhaps I would see more velocity.</p><p></p><p>I have shot the 7 STW's with a zero freebore reamer shooting the 140's in the area of 3650, 27" pac nor three groove 11 Twist barrel. The same reamer has cut 7 Mag Sendero barrels that finish at 25" and shoot the 140g at 3550 and the 120's at 3850 shooting very small bug holes.</p><p></p><p>When you throat out, you decrease the accurate rounds you are going to get on the barrel, so go down this road with your eyes open wide. You will be replacing barrels more often with .190-.220 freebore because the 180's like to be near or touching the lands.</p><p></p><p>Current thinking for 180's is .190-.220 because the shooters are not smart or diligent enough to monitor for doughnuts, first, More velocity from throating out is a second reason, some think that the bullet's base being below the shoulder/neck junction is bad for accuracy, and finally seating the bullet out will allow room for more powder. </p><p></p><p>In choosing this freebore, Hunters may differ greatly from Target shooters due to barrel life and magazine constraints. This brings up another issue, is it logical for a long range hunter to ever use a magazine due to COAL to get close to the lands and magazine constraints?</p></blockquote><p></p>
[QUOTE="keithcandler, post: 1806086, member: 3728"] I am running .115 with the 180's at 3050 with R#26 and 215's in Rem brass shooting tiny groups, 9.25" Twist, Rem SS Sendero. If I were to go with IMR 8133, perhaps I would see more velocity. I have shot the 7 STW's with a zero freebore reamer shooting the 140's in the area of 3650, 27" pac nor three groove 11 Twist barrel. The same reamer has cut 7 Mag Sendero barrels that finish at 25" and shoot the 140g at 3550 and the 120's at 3850 shooting very small bug holes. When you throat out, you decrease the accurate rounds you are going to get on the barrel, so go down this road with your eyes open wide. You will be replacing barrels more often with .190-.220 freebore because the 180's like to be near or touching the lands. Current thinking for 180's is .190-.220 because the shooters are not smart or diligent enough to monitor for doughnuts, first, More velocity from throating out is a second reason, some think that the bullet's base being below the shoulder/neck junction is bad for accuracy, and finally seating the bullet out will allow room for more powder. In choosing this freebore, Hunters may differ greatly from Target shooters due to barrel life and magazine constraints. This brings up another issue, is it logical for a long range hunter to ever use a magazine due to COAL to get close to the lands and magazine constraints? [/QUOTE]
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Reamer recs for 7mm rem mag
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