I have loaded 375Win on and off since it came out, for Lever Actions. That's my experience, jacketed bullets - crimped. I have never crimped anything that didn't need
it. Now for past couple years have a couple of #3 Rugers and have been trying to tune
it for Speer 235g semi spitzers. No crimp. I have been getting some respectable 11/2"
groups at 100yds. Several guys who shoot a lot of single shot straight walls are telling
me that group will improve with crimp. The Speer 235g had no cannulure to crimp and
these guys are shooting cast in older type rifles. This doesn't make sense to me and
I don't want to crimp without cannulure and don't want to buy the tool and have this
come out as BS. Anyone had experience along these lines? I was happy to get 11/2"
out of a#3 and can't see crimp improving on that. With the flat nose bullets for the
375w/ 38-55 my best groups were 3". I've shot two spitzers and one RN and they
all outshoot the FN for accuracy. Didn't crimp any of them.