I am a novice reloader. I shoot a 375 h&h and have never had to crimp a cartrige. I trimmed all my cases to the barns book 2.840 and loaded them with 71gr. rl15 and have seated 270gr barns x with a crimping groove. I understand that if seated to deep will cause exesive preasures. My rifle feeds them nice out of the magazine a post 70 classic. This is the question the lead isn't deep enough to crimp the end of brass is only a few thou. short to reach the groove I am using rcbs dies I don't exactly know should I set the round deeper then crimp, and if so how do I know if I go to deep?