Re: federal primers
I did some 100yd load testing last weekend just to see the difference myself. I was shooting a factory Rem 700P in 300 RUM 190gr SMK with Hodgdon H-1000 powder. The difference at 100yds was considerable, I measured my groups from center to center and subtracted the bullet diameter.
90gr H-1000 215 .426
92gr H-1000 215 1.015
94gr H-1000 215 2.115 (may have pulled a little??)
215m one hole
I then tried one load of Rl-25 and had opposite results.
215 .218 and the 215m 3.020, but by then the range had closed and I talked the guy into letting me shoot my last six to test and I kinda rushed through this may or may not account for the difference. I am going back this weekend with some loaded up to know for sure.
Don't tell God how big your storm is, Tell the storm how big your God is