I have managed to get hold of some 75grain V-Max bullet heads and am working up a load for them. I have them grouping very well "sub .5" @ 100 and the ES is showing at 21 and the SD is showing as 9. Problem is when I take the targets out to 300yds the spread on paper is like a shotgun splatter. (3"+) Whats going on. Can you offer any advice ??? Am I missing something obvious ???