Wallace F
Per my post on page one, loading Cowboy 45 Special with 45 ACP dies is not so bueno. The ACP resize die imparts a slight taper to the case and the taper crimp is not such a good Idea with BP. Suggest you use standard 45 Colt resize die and I really like a Redding 45 Auto Rim Profile Crimp Die.
PS: I screwed up my reply above (fix'd it). For crimping the Cowboy 45 Special I have found the Redding 45 Auto Rim Profile Crimp die to be superb.