I got the Matrix's to a .550" on the first try. I never messed with seating depth. I think I reached the max performance with Retumbo. From 62 - 65 grains I saw little velocity difference. I'm curious what 7828 might do. I spent a tremendous amount of time getting those Berger VLDs to shoot. I bought the 140 Hybrids since I hear they're more forgiving. I'd ordered the PBs with the thinner Berger jacket rather than the thicker target one so I'd guess they'll perform a little better on game rather than the Hybrid.