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Old August 2, 2012, 08:39 PM   #9
Senior Member
Join Date: March 16, 2005
Posts: 102
diopter has it right. For 31's, I recommend an OAL range of 2.8 to 2.9" or so, until one can find a best length. The 11 types unlike the 31's have a more generous chamber that could accommodate the earlier GP-90/23 ammo that preceded GP-11 ammo. There are still plenty of published facts that just aren't so. Let us add to that what someone believes, has heard of or measured perhaps accurately and lets bring in a little confusion too. The current info is better than past but it can still be a struggle sometimes. Thanks Carlos Best All
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