Join Date: Jan 2010
Location: South Central Wisconsin, USA
Re: Blackhawk convertible???
Used cast 38 bullets in a S&W 639 years ago when I shot Bullseye. Mine were a bit heavier than any 9mm load data bullets but, for me, cast bullets are always a lower velo loading. I started low from the data and upped the charge by 1/10gr. increments until the slide fully functioned all the time. They were sweet and punched tight holes. As has been said, feeding may be an issue so keep the ramp clean. Some semi-auto's will feed SWC as well as round nose. DO NOT seat the trial bullet too deep into the case or you will get bulging; the interior case wall tapers to thicker in there. You must have a balance of OAL and bullet length that does not compromise your cases. You may need to size the bullets to .356. Lee's Push Through Die system is pretty nice and inexpensive. They also make 9mm specific bullet moulds.
FWIW, Colt's well regarded 38 revolvers used to be a .356 bore and a gain twist.
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