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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300RUM brass life????????
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<blockquote data-quote="Mysticplayer" data-source="post: 28067" data-attributes="member: 8947"><p>JustC and Barry, Did you have your action lugs lapped for 90% or higher contact? During lockup, does the BOLT face touch the rear of the barrel?</p><p></p><p>Be design or luck, my Enfields that I have built my cannons on have very firm lock up. Brass life so far has been pretty good (about 8 reloads). If there is any slop in the lugs, then the bolt may be bending a smidge allowing for the case to grow and not rechamber. When dealing with these big case magnums, there is a lot of bolt thrust.</p><p></p><p>I have wondered about brass growth and our actions. I really don't think it can happen if there is zero tolerance at lock and no movement during firing. How could the brass expand? So neck sizing would work in this instance. </p><p></p><p>My guess is that there is a "gap" somewhere either in the action or during firing that allows the brass to expand. This expanded brass is very hard to extract (under extreme compression from the action returning to its original size) and usually will not chamber (springs to the new expanded size when extracted). The above symptoms are used to indicate over pressure but could it also indicate action/bolt flex?</p><p></p><p>Would explain why brass life is pretty much forever in a PPC BR rifle. I agree with Darryl that the higher and longer burn of these magnums stresses the brass much harder leading toshorter life. But, I also feel that there must be some give in the action to really accelerate the expansion/stretching.</p><p></p><p>I am comparing both neck and FL sizing with my new RUM. Too hot to shoot right now but when it cools off will let you guys know.</p><p></p><p>The test will compare brass life (number of firings before something breaks), ease of chambering and extraction, accuracy at 250yds. Will use the same amount of powder. Will also FL resize some of the neck sized brass after they no longer chamber and see if I get any head separation.</p><p></p><p>Jerry</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 28067, member: 8947"] JustC and Barry, Did you have your action lugs lapped for 90% or higher contact? During lockup, does the BOLT face touch the rear of the barrel? Be design or luck, my Enfields that I have built my cannons on have very firm lock up. Brass life so far has been pretty good (about 8 reloads). If there is any slop in the lugs, then the bolt may be bending a smidge allowing for the case to grow and not rechamber. When dealing with these big case magnums, there is a lot of bolt thrust. I have wondered about brass growth and our actions. I really don't think it can happen if there is zero tolerance at lock and no movement during firing. How could the brass expand? So neck sizing would work in this instance. My guess is that there is a "gap" somewhere either in the action or during firing that allows the brass to expand. This expanded brass is very hard to extract (under extreme compression from the action returning to its original size) and usually will not chamber (springs to the new expanded size when extracted). The above symptoms are used to indicate over pressure but could it also indicate action/bolt flex? Would explain why brass life is pretty much forever in a PPC BR rifle. I agree with Darryl that the higher and longer burn of these magnums stresses the brass much harder leading toshorter life. But, I also feel that there must be some give in the action to really accelerate the expansion/stretching. I am comparing both neck and FL sizing with my new RUM. Too hot to shoot right now but when it cools off will let you guys know. The test will compare brass life (number of firings before something breaks), ease of chambering and extraction, accuracy at 250yds. Will use the same amount of powder. Will also FL resize some of the neck sized brass after they no longer chamber and see if I get any head separation. Jerry Jerry [/QUOTE]
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300RUM brass life????????
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