floatingboy
Active Member
So I recently got my hands on some 7828 from when it was still Dupont. Cans sealed still. Opened one and everything smelled normal. Smells like my brand new double-base, as far as I can tell. Did a ladder test to find optimum velocity and velocities were WELL lower than the book. Max charge of 61.8 (per Hornady 10th edition) was supposed to be 3100 fps and I had 2850.
New rifle, just broken in. Remington magnum primers. BUT, used brass that should've been annealed (I'm still learning). Could lack of annealing account for THAT much difference in velocity? If I understand correctly, it would cause the brass to not seal the chamber as effectively and pressure would be lost. The case necks are tad sooty, not sure if that has anything to do with not sealing. The shoulders were bumped back 2 thou, just enough for the bolt to close.
Side note, Hodgdon's site lists the max load for 120 gr 257 Wby as 69 grains of 7828 vs Hornady's 61.8. Seems like a BIG difference.
New rifle, just broken in. Remington magnum primers. BUT, used brass that should've been annealed (I'm still learning). Could lack of annealing account for THAT much difference in velocity? If I understand correctly, it would cause the brass to not seal the chamber as effectively and pressure would be lost. The case necks are tad sooty, not sure if that has anything to do with not sealing. The shoulders were bumped back 2 thou, just enough for the bolt to close.
Side note, Hodgdon's site lists the max load for 120 gr 257 Wby as 69 grains of 7828 vs Hornady's 61.8. Seems like a BIG difference.
