45 gap Question

Guessing you might need a separate taper crimp die, but your .45 ACP sizer die should work just fine. Midway shows some die makers that have dual die sets, but others are specific to that caliber. Your .45 ACP bell die may not work since the GAP case is shorter.

RCBS shows them as the same dies .45ACP/.45AR/.45Gap hornady doesn't list a Gap but suspect it would be the same. Key word there is suspect

I reload for the GAP and some people have great luck with ACP dies & some don't for the simple reason that the sizing die may or may not go down far enough. I broke down & bought the Lee .45 GAP dies and the only difference between them & ACP dies is that the GAP set contains a .455 Webley sizing die that works great.

I don't load the GAP, but I do know that the powder that has consistently provided the best accuracy in numerous reloading reports has been Ramshot True Blue.