mine are close, but not the same.
I have two SSK guns
two model 1 uppers
two pacnor 300-221 barrels
one olympic 300 fireball upper
two require different shoulder length brass and die settings to headspace correctly
the SSK guns have tighter base dimension, more noticable running super sonic loads. Brass that fails around the base in the other guns live fine in the SSK guns.
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