Nitrox-Maybe ARNOLD.He kncked off bigger game in Kali.
I chose 1 in size as it was what it took with expander
set I made to get it straightened out with no shoulder left.

I read of articles about Ross hunting with his 4 bore
in AUS and he says the paper cased gun he has is
.975 and if brass cases .050 bigger.He had brass cases
with walls as thick as the paper, made I understand.

Another guy, John Millar, from Alaska building 4 bore and hunting in Africa. Here is excerpt from his writings
in African Hunter-----
""The so-called 4-Bore’s bullet diameters varied widely in the cartridge versions usually around .935 to .955 with the true one inch size normally found only in the old muzzle loading rifles. The 4-Bore size being an old reference measurement of 4-Balls to the pound of lead, which computes out to 1750 grains of weight. The cartridge rifles usually fired projectiles weighing around 1850 grains. I settled on a bullet diameter of .962, a weight of 1600 to 1850 grains and a case length of four and one quarter inches, which were the dimensions of Holland and Holland’s one and only Nitro loaded 4-Bore that they built for a Maharajah.""

Interesting fun--Ed.