My first choice would have been 4831 based on burning rates, although i've never loaded 7mag. It's just a little more capacity than 270win. I started loading on RCBS equipment back in the early 70s and now I do most of mine on a Lee 4 hole turret press and I like it much better. Ialso have a RCBS uniflow powder measure which isn't as accurate as my son in law's lee measure. I have a Dillon RL 550 which I load my .40 cal ammo on, but for rifle it is the Lee. I haven't read any opinions about the Lee collet size dies ,but I just love them, no lubing ,no stretching and almost no trimming-----and verrrry accurate ,whatta yall thank!