I have a pre 64 Mod 70 300 H&H Bullgun which factory made for 1000 yard shooting with 28" heavy barrel. I would not go heavier than 175 gr. Sierra MK bullets as heavy bullets and slow propellant eats barrels for breakfast.
Vihta Vouri should give you best barrel life as it burns cooler.
Do not use ball propellant as most of it eats barrels for breakfast as well.
Distinguished Rifleman High Power & Smallbore Prone, Presidents Hundred (Rifle), US Palma & Dewar Teams , Formerly US Army Picatinny Arsenal Small Cal Wpns Lab, Spec Projects Group Dover Devil Cal 50 Machinegun , Small Arms and Ammunition Test Director Aberdeen Prov Gnd, Member Int Wound Ballistics Assn., consultant to Fed Law Enf Tng Ctr, Glynco, US Border Pat, Defense Crim Inv Service, Army Munitions and Chem Cmd, Army Wound Ballistics Lab, NRA Life 1972, AC4HT, Firefighter 1, Shriner
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