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Rifles, Reloading, Optics, Equipment
Reloading
556 military brass resizing issue
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<blockquote data-quote="barefooter56" data-source="post: 1133260" data-attributes="member: 85389"><p>tailbon3,</p><p>This is a pretty common issue due to the fact that 5.56x45 chambers are on the large side to accommodate full auto operation and that issue is exacerbated by the cartridge case extraction starting before the cartridge has fully let go of the chamber walls before extraction starts. Which is also why you should full length size cartridge cases fired in a semi-auto rifle. The die(s) you have evidently will not compress the brass PAST the point where when the case "springs back" coming out of the die the dimensions stay small enough for the brass to chamber in YOUR rifle. When I do re-sizing on this type of brass I use a small base full length die. Now, a small base die doesn't indicate that ALL the internal dimensions of the die are smaller. Just the part that sizes the base of the cartridge case . In short, the cartridge case base MAY be sized to fit your chamber BUT the shoulder has not been bumped back enough to overcome the spring back issue or just isn't short enough to contact the shoulder of the cartridge case period. A good cartridge case gauge like an L.E. WILSON can help you determine just what the issue is. cartridge base or cartridge shoulder. If its the shoulder not being bumped back enough. You could have the bottom of the die faced of by .001-.002 and set it up so its touching the shell holder at full ram extension and size a couple pieces of brass and check them in your case gauge to see if they drop in and fit per the instructions (case head is between the upper and lower steps or even with the upper or lower steps . the other end checks the trim length and the case mouth should be flush if that,s correct). If the cartridge base is still to large after sizing to fit in the case gauge . You will probably have to try another small base die or get with the die manufacturer and see what they require to make you a die that will fix both issues at the same time during sizing. OR you can buy the pre-sized brass like TOP-BRASS etc and check them all with your case gauge to be sure of trim length and size being correct before loading. Using brass that has been fired in any rifle but yours can open a can of worms real fast as you have found out. I reload once fired 5.56x45 brass also but luckily I have 2 REDDING FULL LENGTH dies that address both issues. </p><p>Good luck!</p></blockquote><p></p>
[QUOTE="barefooter56, post: 1133260, member: 85389"] tailbon3, This is a pretty common issue due to the fact that 5.56x45 chambers are on the large side to accommodate full auto operation and that issue is exacerbated by the cartridge case extraction starting before the cartridge has fully let go of the chamber walls before extraction starts. Which is also why you should full length size cartridge cases fired in a semi-auto rifle. The die(s) you have evidently will not compress the brass PAST the point where when the case "springs back" coming out of the die the dimensions stay small enough for the brass to chamber in YOUR rifle. When I do re-sizing on this type of brass I use a small base full length die. Now, a small base die doesn't indicate that ALL the internal dimensions of the die are smaller. Just the part that sizes the base of the cartridge case . In short, the cartridge case base MAY be sized to fit your chamber BUT the shoulder has not been bumped back enough to overcome the spring back issue or just isn't short enough to contact the shoulder of the cartridge case period. A good cartridge case gauge like an L.E. WILSON can help you determine just what the issue is. cartridge base or cartridge shoulder. If its the shoulder not being bumped back enough. You could have the bottom of the die faced of by .001-.002 and set it up so its touching the shell holder at full ram extension and size a couple pieces of brass and check them in your case gauge to see if they drop in and fit per the instructions (case head is between the upper and lower steps or even with the upper or lower steps . the other end checks the trim length and the case mouth should be flush if that,s correct). If the cartridge base is still to large after sizing to fit in the case gauge . You will probably have to try another small base die or get with the die manufacturer and see what they require to make you a die that will fix both issues at the same time during sizing. OR you can buy the pre-sized brass like TOP-BRASS etc and check them all with your case gauge to be sure of trim length and size being correct before loading. Using brass that has been fired in any rifle but yours can open a can of worms real fast as you have found out. I reload once fired 5.56x45 brass also but luckily I have 2 REDDING FULL LENGTH dies that address both issues. Good luck! [/QUOTE]
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556 military brass resizing issue
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