7828 is my choice, I've got a Winchester 70 & Remington 722 in the 257 Robt's. I've used imr 7828 since it's inception in '87 & have never went back. There weren't any reloading books at the time with the load data for the new powder, I wrote Leupold a letter, they sent me information on the 7828 loadings with the Nosler bullets & I've been using it since. My loads are with 120gr PBT bullets, any brand brass I happen to have at the time, any large rifle primers. The last five shot ballistics I had on the Chrony were: 3298 3259 3248 3245 3230.
overdrawn:
Your post is confusing to me.
1) why would you ask Leupold (a scope manufacturer) for loading data??
2) what does "PBT" mean?
3) how much 7828 are you using in your 257R to get over 3200 fps with 120gr bullets? Hodgdon lists 47grains as a maximum load, with a velocity of 2745fps. And 47gr of 7828 is listed as a compressed load. How can you get enough in the case to get velocities that are 500 fps higher than a maximum (compressed) load???
4) please identify yourself at the ranges where you shoot. If you are there, I want to leave
