I use Hornady dies for 44/38/357 and the roll crimp is very nice. I do trim all my brass in these calibers as others have mentioned and the roll crimps are very consistent. I have found with the Hornady dies there is a very fine line between a good solid roll crimp and a buckled case. I'm talking 1/16th of a turn. Trim the brass and get it set and you're golden.