I'm using RCBS dies, I have a Lee Classic Press and I also ordered a Lee Factory Crimp Die (which is kind of essential). I found my rounds in the magazine were getting shorter from the recoil before I started using the Lee Crimp Die. Don't start too low powder wise with your reloads. Hang fires can occur. I use Jamison brass, Federal 215 primers and 103g H4895 pushing a 570g TSX to 2300 fps. In my rife 101g H4895 generates around 2180 fps which is a nice 500 NE type load.

Good luck, it's a great caliber,

Chuck