Hello all. I just purchased a Kimber 8400 in 300 Win Mag and then bought 2 boxes of new Nosler Brass. I checked the Lot Number to insure they were the same lot but then weighed them anyhow before dropping them in the MTM box I purchased at the same time.

With my 338 Win Mag I purchased one box of Nosler brass that was all the same weight (+/- .3 grains) and reduced my 100 yard group by a 1/2 inch.

these 2 boxes weigh in at

Box 1 = 214 gr +/- .3 gr

Box 2 = 215 gr +/- .3 gr

all the cases are the same length +/- .005 so that is not the extra gr I am seeing

How much will this affect my accuracy?

This is will be my primary hunting weapon so in realty all I need in minute of deer or moose but there is something to be said for the confidace of knowing you are carrying a sub half MOA rifle when you spot that critter at 400 yards.