you can get dies, brass etc for 45 for far less than the price of converting to 40 - the only really "big" expense is the press- then you can go either way- a single stage, turret, or progressive-there was an article in guns and ammo way back when the author wanted to see how many conversions he could make from a 1911- this was before the 40 s&w came out- he used a colt commander in 38 super to start something on the frame in the 45 had to be changed and he didn't want to get all fancy- he came up with 5, but discounting the 22, really 4- 38 super, 9mm, 45 and 30 tok - all it took was slides and barrels