What kind of cases are you using?
Military cases usually have thicker walls which decreases the volume of powder that will fit in the case.
Aittle compression is actually good (from what I hear) you get a very uniform flame front traveling through the case (so says some of the BR folks)
I use 41.5gr of IMR4895 with Nosler 168's in Win cases, works excellent in my M1A.
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