Bwinters,
As mentioned in one of your earlier threads I've done the 1911 45 Super conversion and like it, BUT;
I would not do it on an aluminum frame. Also the 4 inch barrel (shorter slide) also reduces the slides weight which would 'probably' equate to faster slide velocity and possible battering.
I'm doing pretty much the same thing for my woods carry gun, an aluminum framed 1911 4.25 inch barrel. Nothing but standard pressure loads except I plan on trying plus p/hardcast and running very few of those... to insure function and for carry if all is well.
If you are insistent on lighter weight and 45 Super I would look no further than a polymer pistol... the Glock or the HK USP have both been proven. OR look at the Springfield Armory polymer 10mm.
Have fun,
Jerry
