I found this mint 75 Winchester Model 70 in 375 H&H 1:12 twist 24 inch bbl. I have tried 69 Grs. of 4064 and RL15 with the 250 grain Sierra bullet. I also have some Speer 235 grain bullets enroute. Since it costs a bit more to develop loads for this caliber, does anyone have the magic formula than makes 250 and 235 bullets shoot tight in flight. I have to admit that I'm fond of using IMR and Alliant Powder. Any help will be very appreciated.
THKS,
C F