Are these dies good? If it matters, I am reloading .280 AI, and just ordered a rifle so I have some time to accumulate supplies. The only thing about them that I'm not sure about is that the seating die applies a roll crimp. Do I want that? I don't reload all that much, but I'm trying to get more precise. Are these the dies that I'm going to want to do that with or should I be looking towards a competition seater and something else for resizing??? Thanks.