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Old June 13, 2011, 08:57 PM   #10
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Join Date: June 17, 2010
Location: Virginia
Posts: 4,716
Again, the OP says problem occurs where the cartridge is (not) stripped cleanly/completely from the magazine to enter the chamber. If the round chambers freely after that (i.e., the bolt closes), it is not a small-base sizing problem.

QL tells me 27gr BLC2 under a Sierra 55gr FMJBT w/ an OAL of 2.230" produces a shade over 50,400psi, which is not an overly-aggressive load. (Hornady max's out at 28.1gr BLC2 -- which may be also be case capacity limit.)

My bet it still on a magazine-related phenomenon. (By any chance do you use the magazine for a left-hand hold point?)
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