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Old 09-23-2012, 14:33   #2
Tiro Fijo
Senior Member
Join Date: May 2011
Posts: 6,281
Hydraulics & velocity I'd imagine. Since the .45 cal. has a wider HP cavity then it only goes to say that it probably needs less "assistance" via the skives at a higher velocity. As an example, the old Speer 200 gr. "Flying Ashtray" opened up very well at over 1,000 fps. Under that & it didn't. Of course, that was before the technology of today.
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