Are your groups ushally higher or wider?
Just a thought as the width of the group is most likely shooter/rifle error and the height would be shooter/rifle error plus ES velocity error, by that way of thinking if your groups are wider or square I don't think the velocity spread would be an issue worth to much time.
Just a thought, my groups are ushally like a triangle or if a high round count it's fairly circular which would indicate that I'm not getting great vertical spread from the load, if you had a consistent big vertical oval though it may be somthing to investigate further.
I'm no great shot but trying to look at this analytically.
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