Sometimes I think that a 2 to 3 thou inconsistency in measurements is largely unavoidable. Given the machinery involved and the the measuring devices we use.
I've experienced the same "flyers" with shoulder bump (headspace) and also seating depths. With seating depths you can use the same die in the same press, same brass and same projectile batch, same force on the ram, and still end up with a 1 to 3 thou difference in a batch of ammo.
Maybe these variables are able to be totally eliminated but I've tried to no avail, and have settled for the consistently accurate ammo I produce within the variances.
Thats pretty much all that matters because there are a raft of other variables that come into play once the ammo is in the chamber and the crosshairs are on the meaty brown bit
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