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I absolutely believe you, read of this issue with 'SWC bullets impeding extraction' in several GLock .45 ACP pistols over the years, which is why I never even tried the SWC profile....This is not a rumor in my case. I have a Glock 30SF. I understand that the 30S is built on an “SF” frame. As I understand it from the web, the slide to frame geometry is a little different in the SF models than the regular 30 in order to accommodate the shortening of the frame. In any event, my gun will not function with 200 grain lead SWC rounds. It is not a feeding problem but an ejection problem. .
Precision Bullets' 200 and 230 gr RNFP looks like 95% ball with the last .07" lopped off with a fairly modest rounded flat point; feeds great in everything, including a friend's Tommy Gun.