Re: FPS Check...
Velocity is a bit low, but that's not surprising. Varget is a great powder in the 5.56, but not for the bullets you're using. Varget an RL-15 are the two top powders used by competitve shooters, delivering both the best accuracy and velocity with the bullets we use for such shooting. However, these are generally 77-82 grain match bullets; NOT the 55s you're using. There, you'll need a faster burning powder to get better velocities. I'd suggest Benchmark, H322, N133 or N135 for the best velocities with the lighter weight 55s. Got to match the powder to the bullet, and there is no one powder that works best with the entire weight range of bullets in any cartridge. The 5.56mm is no exception here.
Hope that helps.