257 weatherby
I do not use crimping when I reload with any cases that have a shoulder I have found that it is not needed with the calibres I use I think cases with no shoulder need it, Accuracy with all my guns is very good with out crimping if you use bullets with a cantilure you can crimp but not nessesary. I shoot a 257 weatherby, 7MM RM, 270WSM, 338WM, 25-06, 270win with out crimping.