When have you had facotory ammo shoot better than your hand loads? I have been hand loading several rifles for a few years now, 15 or better, always get my loads to shoot well enough to feel confident to 400 yards. I like the selections I can make for some calibers you cannot buy ammo for, like my 350 R.E.M. Mag, the .284 Win, .358 Win., 7x57, 35 Whelen.
So I have a used 7MM Weatherby Mag, I have 3 boxes of Weatherby factory 160 grain Nosler Partitions, 3,200 fps at the muzzle, good enough for me! I take it to the range and shoot up 10 rounds getting it to paper, I settle in at 100 yards on sand bags, Zeiss HD5 set at 10 power, breath and squeeze off 3 rounds, the 15 power binos show me what I could only hope for! Best group I have ever shot with any rifle using factory ammo. I took it home and added the tape to it and it's at 0.687", not shabby for a caliber people say is inaccurate. At this time, yes, I will be sticking with the factory loads!