Clark
Member
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I wanted to test the idea that the small primer brass was stronger.
Preliminary results with 22.5 gr. W296 and Sierra 2310 180 gr .311" bullets, 2.19" OAL, [73kpsi and 2200 fps Quickload]:
RP brass, WSRP: .005" extractor groove expansion, ruined Yugo SKS firing pin
Win brass, CCI200: .008" extractor groove expansion, Albainian SKS ok
I did the Albainian and large primer first, and I think I have an out of control variable with the tighter Yugo chamber drove the pressure up. Here are some pictures of the embossed shape of the brass case head that flowed into the Yugo breech face. Note the embossing aroung the "X" where the brass flowed into the extractor slot of the bolt.
I have more firing pins on order and will try again with shorter OAL.
I wanted to test the idea that the small primer brass was stronger.
Preliminary results with 22.5 gr. W296 and Sierra 2310 180 gr .311" bullets, 2.19" OAL, [73kpsi and 2200 fps Quickload]:
RP brass, WSRP: .005" extractor groove expansion, ruined Yugo SKS firing pin
Win brass, CCI200: .008" extractor groove expansion, Albainian SKS ok
I did the Albainian and large primer first, and I think I have an out of control variable with the tighter Yugo chamber drove the pressure up. Here are some pictures of the embossed shape of the brass case head that flowed into the Yugo breech face. Note the embossing aroung the "X" where the brass flowed into the extractor slot of the bolt.
I have more firing pins on order and will try again with shorter OAL.