I am a little miffed at my measured velocity differences during my load development phase. I have sorted all my cases (R-P brass),I have 24 3x reloaded brass. All weight within a half gn of each other. I have sorted my accubonds so they are all the same weight exactly. Tumbled, then ultrasonic cleaned prior to loading. All brass sized to exactly the same dimensions. with the exception a some slight variance in case neck length.+/- .001. This batch of cases was annealed prior to this loading. I have each charge measured exactly. Used rcbs charge master for all weight measurements and powder throwing. Primer pockets all uniformed. I got my best group with 74gn H4831sc measure at 2960, 3011, 2932. 3 in the x, perfect clover leaf (.4x in.) How can i get this group with the variation in measured velocity, what can i change in my procedure to tighten this up some. bullet seated .010 off the lands. I am scratching my head here?