I've been wanting to try the JSG. My hunting buddy and I tried the APP 3f - he in a 54cal Hawkins and me in a CVA Optima Pro. I tried various loads, but could not get consistent velocities - I mean varying by 300 fps with weighed charges. So I gave up and went to T7 2f. My buddy had better luck, but noticed his accuracy drop off near the bottom of the jug. The APP varies a lot from fine powder to kitty litter consistency. Does the JSG 2f have more consistent grain size?