Before buying one of the higher priced , custom made , hollow base 45 Colt moulds , I would try out the double cavity Lee 452-200-RF boolit . It has as much bearing surface as a 452-200-SWC .
It has twice as much bearing surface as the stubby 452-160-RF and easier to handle .
the 200 gr. weight Vs the 160 gr weight (40 grs) may not be too objectionable .
I checked the NOE moulds and they have a few 45 ACP designs less than 200 grs....
But ...they have a neat modified wadcutter with a short sharp point @ 167 grs,
NOE #454-167-SP-BH3 , nice crimp groove and enough bearing surface to stabilize ...and no hollow point or hollow base to worry with .
you need to look at it (sorry I don't know how to get it on the screen ) here is link
www.noebulletmoulds.com , look in the shop ... it's a neat little boolit and might be just what you are looking for in the 45 cowboy special !
Gary