I'm working with W760 right now. does anyone know a good charge to get the nosler partition grouping well?
I'm also interested in any other accurate loads with different powders for this bullet

My working load is 78/760/300 for 2590 fps and 1 MOA in my 22" barreled Whitworth. I've even worked up to 80 grs for 100 fps more, but this load is above any published max, even tho it shows normal pressures in my gun. This rifle shoots any load with any powder inside of 1.5", so it's like many other .375 H&Hs in that regard--it's an easy cartridge to load for.

ah, Well I loaded 76 & 77 to start out with, but ran out of powder. I picked up some IMR4350 so any accurate 300 partition loads with that powder would also be appreciated.

I also picked up some RL15 & 270 gr hornady spire points

Now I'm just waiting for my gun to arrive.

These loads will be shot out of a stainless M70

Generally anything over an inch I keep working on the load.

I use RL 15 in my "hunting loads" in my model 70 and get good accuracy...well under 1" for 3 shots. Load is 67.0 gr RL 15 CCI magnum primer and bullet seated .030 off of rifling with 300 gr Partitions (chronograph 2510 fps). With the 260 gr Accubond I use 68.0 gr of RL 15. For practice loads I do use W760 but do not get the velocity or accuracy as with RL 15.

rel15, -0.0275 to -0.030, mild/middle loads, neck or partial resized brass only

I'm shooting tiny groups with big doses of RL-15 and 300 grain TSX's. I also use same powder for the 300 grain Nosler Partitions and they group just under and just over an inch at 100 yards. I tried several other powders including IMR-4350 and RL-15 was the definitive choice for my rifle. By the way mine is a Win M70 Stainless Classic unchanged in every way except scope bases and I adjusted the trigger mine still has the "hot glue gun" bedding on the recoil lug!

I have had good luck with 300 grain Hornady's and 300 grain Partitions with 67 grains of IMR 4064, Remington brass, and Remington magnum caps. I use 66 grains of Reloder 15 with a conventional solid to hit where the softs hit at 100 yards.

My load is 80 grs IMR or AA 4350 for 2550 fps.
Perfect in every way.

PH

68 grains of IMR 4064

I'm using a max charge of IMR 4350 and Fed mag primers for my 300 partition loads. I'm also using Win brass. My rifle kept tightening up the groups as I approached max.