Clark
Member
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Today I got some over pressure signs in the AR15.
You can see the extractor has almost pulled off some of the rim, the case head has expanded into the ejector slot, and the body has nearly separated from the case head.
This was with 18 gr Blue Dot, 33 gr Vmax moly, 2.170", and generally gets 4025 fps in a 26" #1, but every fouth or fifth one will get 4125 fps and horrible pressure sign. The normal ones had no extractor groove growth, but the bad ones had .005 to .010" growth.
Accuracy in both rifles was ~ 1.4 moa
Today I got some over pressure signs in the AR15.
You can see the extractor has almost pulled off some of the rim, the case head has expanded into the ejector slot, and the body has nearly separated from the case head.
This was with 18 gr Blue Dot, 33 gr Vmax moly, 2.170", and generally gets 4025 fps in a 26" #1, but every fouth or fifth one will get 4125 fps and horrible pressure sign. The normal ones had no extractor groove growth, but the bad ones had .005 to .010" growth.
Accuracy in both rifles was ~ 1.4 moa