Do you have 223 small base die or 222 reloading die or know someone who does? how about 380?
223 die should reduce from .377 base to .350 at shoulder 1.44 inches from base. -
222 die should reduce from .377 base to .358 at shoulder 1.25 inches from base
221 fireball die should be .377 base to .361 at shoulder 1.07 inches from base.
380 ACP will do a reduction to .372.
can you do some measurements exactly how far from the base your brass is bulged and by how much?
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