I sighted my new 4X12 56 mm scope today and I wanted to go varminting. I was low on 100 grain bullets for my standard .270 winchester. So i just grabbed a bag of my previously resized/cleaned/primed brass. I loaded up about 100 rounds of 100 grain with IMR 4320 52 grains. Without thinking I realized that they were all CCI 250 mag primers. The load is under max with large rifle primers that i tested before by @3 grains. I've heard that mag primers is like adding a couple of grains of powder. What's your opinion before I shoot one?