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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Brass shot from factory remington 7RUM too tight in new Mc gowen barrel?
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<blockquote data-quote="MontanaRifleman" data-source="post: 921303" data-attributes="member: 11717"><p>I agree that under "normal" circumstances you shouldn't have to shave off the die or shell holder. However, the cases fired in the factory chamber may have been stretched to such a point that they might need to be "overly" resized to get them back to at or near SAAMI spec and to fit in your chamber. You can't put shims under cases as the cases will not fit into the shell holder with shims in place. Shouldn't be able to anyway. </p><p></p><p>How are you setting up your sizing die? Standard instructions and procedure for FL sizing is to bottom out on the shell holder and turn it down another 1/8th to 1/4 turn. If you are only bottomed out on the shell holder, another 1/4 turn may get you there. I have some 300 RUM brass that after about 4 firings or so of high pressure loads will no longer fit my fairly tight custom chamber after FL sizing. I had to turn the die down a full turn past bottomed out and use a very heavy vam over stroke to get a case to chamber very tightly with some effort. I count that brass as done. I don't think yours is.</p><p></p><p>Turn your die down 1/4 turn past bottoming out and see what happens. If it's not chambering easy, continue to turm your die down a 1/4 at a time until it does but I wouldn't go farther than a full turn. If you have to go past 1/4 turn down to get a case to chamber, then I would HIGHLY recommend you shave down the shell holder or die. BTW, what 7 RUM sizing die are you using that is carbide? Shaving down a shell holder, or die will be a lot cheaper than buying a new lot of brass. It cost me $25 per die to have mine done.</p><p></p><p>Another issue here might be that the bolt face of the factory rifle is out of square. My smith received a rifle from another client of his that supposedly had a blue printed action. The clients sized cases would not chamber after firing. Close inspection revealed that the bolt face was 7 thou out of square and firing the brass gave case heads a cant. So, unless the cases were timed on the bolt face the way they were fired, they would not chamber.</p><p></p><p>I also agree with measuring all the critical areas on the cases. Base/web diameter, about a 1/4" above the web and the shoulder diameter and the case OAL. The cases that will no longer chamber in my RUM, after sizing, measure the same diameter 1/4" above the web as at the web which is .550 The cases that will chamber measure .548 1/4" above the web. The brass got pressured and stretched to the point what it would no longer size above the web without extreme measures.</p><p></p><p>Hope you get it figured out.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 921303, member: 11717"] I agree that under "normal" circumstances you shouldn't have to shave off the die or shell holder. However, the cases fired in the factory chamber may have been stretched to such a point that they might need to be "overly" resized to get them back to at or near SAAMI spec and to fit in your chamber. You can't put shims under cases as the cases will not fit into the shell holder with shims in place. Shouldn't be able to anyway. How are you setting up your sizing die? Standard instructions and procedure for FL sizing is to bottom out on the shell holder and turn it down another 1/8th to 1/4 turn. If you are only bottomed out on the shell holder, another 1/4 turn may get you there. I have some 300 RUM brass that after about 4 firings or so of high pressure loads will no longer fit my fairly tight custom chamber after FL sizing. I had to turn the die down a full turn past bottomed out and use a very heavy vam over stroke to get a case to chamber very tightly with some effort. I count that brass as done. I don't think yours is. Turn your die down 1/4 turn past bottoming out and see what happens. If it's not chambering easy, continue to turm your die down a 1/4 at a time until it does but I wouldn't go farther than a full turn. If you have to go past 1/4 turn down to get a case to chamber, then I would HIGHLY recommend you shave down the shell holder or die. BTW, what 7 RUM sizing die are you using that is carbide? Shaving down a shell holder, or die will be a lot cheaper than buying a new lot of brass. It cost me $25 per die to have mine done. Another issue here might be that the bolt face of the factory rifle is out of square. My smith received a rifle from another client of his that supposedly had a blue printed action. The clients sized cases would not chamber after firing. Close inspection revealed that the bolt face was 7 thou out of square and firing the brass gave case heads a cant. So, unless the cases were timed on the bolt face the way they were fired, they would not chamber. I also agree with measuring all the critical areas on the cases. Base/web diameter, about a 1/4" above the web and the shoulder diameter and the case OAL. The cases that will no longer chamber in my RUM, after sizing, measure the same diameter 1/4" above the web as at the web which is .550 The cases that will chamber measure .548 1/4" above the web. The brass got pressured and stretched to the point what it would no longer size above the web without extreme measures. Hope you get it figured out. [/QUOTE]
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Brass shot from factory remington 7RUM too tight in new Mc gowen barrel?
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