I am developing a load for a 45/70 Marlin for use on deer and boar. The problem is, it's a slightly oversized microgroove barrel rifle that is not sufficiently accurate with standard cast lead bullets. After a hell of a lot of time and trial I appear to have an accuracy load with 300 grain jacketed hollow point bullets giving a MV of about 1900 fps with 2420 ft/lb muzzle energy, delivering 1040 ft.lb at 200 yards, according to Quickload. More importantly, accuracy seems a reliable 1.5" group at 110 yards, with a one inch either side point blank range from 20 yards to 125yards.
My question is for anyone who has used such a round, or similar, is to do with the terminal effect in respect of meat damage. Any other informed observations would be welcome.