Ever notice when you have that accurate load developed how well it grouped with the barometric pressure that day. I write down all the specifics of not only the load data but the B.P. also, granted the load will group good on other days however for this 6.5×55 Ackley Improved round when I see a B.P. of 2944 I’m headed out for some tight groups and excellent velocities too!
6.5×55 A.I. IMR 4831 powder and a 123 grain Match King, 4 rounds @ 100 yards.