That variation is entirely fine. TrailBoss is not designed to be a long-range propellant (duh). It's designed to be easy to load safely to send slow projectiles through the target with minimal recoil, fuss, muss, and bother. If you get a load that shoots a group at 100 yards, shoot it. I tried it in standing for highpower, and it did not provide a score advantage, but that's at 200 yards. It is still my go-to powder for teaching young people and non-shooters how to send 'em.