So far, I've got about 60 rounds through my new Hells Canyon BAR Mk3 300 WSM. I'm shooting my reloads and figured out that my bullet crimping was too much and bulged the case a little below the shoulder resulting in the bolt not closing completely. I'm using 180gr Barnes TTSX and for my next batch of reloads I'm going to seat the bullet so that one of the groves is under a very light crimp so as not to bulge the case. I'm wondering if anyone has had any problems with bullets moving inside the neck on a BAR when using a light crimp; or even no crimp? My last trip to the range gave a nice 300 yard 3-shot group with 63 grains of Ramshot Big Game powder and CCI magnum primers using Nosler brass. The pic below shows this along with my .243 grouping in the lower right.