- Dec 25, 2020
- Home of Jesse James
89.8 the bolt was stiff to open. Assuming it was from pressureI would recommend shooting 2-3 shots per charge with the same style test. If you’re using a Magnetospeed don’t attach it to the barrel when shooting groups or looking for point of impacts shifts. I typically load a course pressure test to find when I hit pressure with the combination I’m using. Then I back off 0.5gr from pressure and work from 3.5gr below pressure to 0.5gr below pressure shooting 2-3 shots for each charge looking for similar points of impact. For example, let’s say 90gr was max, I would start the test at 86.0 and work up to 89.5 grains. Same style test you did, but with more shots per charge and less charge weights being tested. I don’t really want a max pressure load, and I don’t want something that’s going to be slow or I’ll just shoot a smaller cartridge. So I find a nice window to test in that will meet or exceed expected velocities and have stable point of impacts for several charge weights in a row.
Let me ask, where did you hit pressure with this test? Or did you see any pressure signs like heavy bolt lift or shiny ejectors marks on the case heads?