from what they sold me, very little effect. and i have a 32" barrel. I was using goex at the time and they said i wouldnt be to far off from their 28" barrel Stats. Im not one who pays much attention to FPS, Ft lbs energy. I leave that for the others who do care.

As long as the load is accurate and the projectile is performing and my shooting ability is good for the range im sighted in for, Its going down.