Picked up a bunch of 9mm cases...they are ridged on the INSIDE of the case- the step is solid all the way to the bottom of the case... 1- greatly reducing case capacity, higher pressure less powder???? 2- No way to seat the bullet too far in the case, nor will it "walk back" due to recoil... still a bit odd... sorry for the bad photo, will try again with another camera if there is interest... thought it might be interesting....
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