I have Lee Factory Crimp dies for every caliber that I load for. Admittedly, most of them are older levergun calibers, but I do load 30-06, 308, 243, and 7mm-08. While I go thru an additional step using the LFC for the latter calibers, I guess what I do can't really be called an actual crimp. More of a slight bump that kind of equalizes the tension around the bullet at the case mouth. Just a little. It seems to help in terms of slightly tighter groups. Before LFC's came out on the market, I didn't bother to crimp for the boltgun calibers at all, and most loads still shot pretty well.