I'm really just getting into the SA's, almost exclusively Blackhawks. I'm wondering if the convertibles have any popularity out there. I'm looking at a 7 1/2" .45LC/.45acp and I started asking myself what really is the point of the acp? Likewise the .357/9mm although I can see using the 9 as a little cheaper round when just plinking. But then I started asking myself if I get use to shooting the acp or 9, do I then need to relearn the LC and .357? Any advice would be appreciated.