Hi Smudge,
I dont use your powder, I use 38.6gns of H4350 which some way below max, This is to feed a Sako 75,
The one thing I found all componants make a difference,primers,case type,oal etc, the most improvement thing i found was to ensure the cases are trimmed to exactly the same length and from of the same batch and make
good luck
smithy
smithy