Fortunately today you can have both. I'll probably set the rifle up for a mag fed platform and single feed if I want better performance. Obviously for optimum accuracy, throating the chamber for the bullet you'll use is best. I found that the ELDs are very tolerant of jumping a long ways without losing any accuracy in fact I get the best accuracy with long jumps using ELDs. Berger's not so much. Berger's for matching the chamber reamer spec and mag fed rounds using ELDs. Best of both worlds. This 300 PRC build will be a lengthy build as I'm doing a 6.5-284 currently. Just gathering the parts slowly. I'll use a MDT chassis on a Weatherby action for the build. 9 twist barrel is what I'm thinking in a Palma contour.