Barometric Pressure Sweet Spot

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.

6.5x55 Ackley Improved

6.5×55 Ackley Improved

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