I finally got my 750 (identical to yours) out last weekend. I shot a variety of loads using 250 gr. Speer SP, 200 gr. Hornady SP, 225 gr. Nosler BT, and some old 275 gr RN mfg unknown. The gun cycled perfectly for all, and all shot groups that could be hunted with.
The 200 gr load was over 55.5 gr of 3031, that I have used in an older rifle to take a bunch of whitetails, this gun likes them pretty well to, with groups just over an inch.
On the 250 grain bullets, the gun seemed to like them the faster they were going, some of which were pretty hot, but not overloaded.
My hunting load will be with the 225 gr. Partiton over a case full of RL 15. The Ballistic Tips look real promising, so I will do some more work on them.
this was my second trip to the range with this rifle. First trip was with 225 gr bullets, no big disappointments. The rifle is turning out to be easy to get along with.
Next trip out will be with the chronograph.