Thanks you all for the help. I do have some factory rounds I have benchmarked off of. They are not nearly so flat as my hand loads. I'm going to load a few sets today and test. I Have been using fed210 but today I'm going to try rem 91/2.
I have used magnum primers in the past. Could these take a load that's say, at max with std primers and push it over the edge and create high pressures?
