333 OKH is nothing more than a 30-06 case necked up to take .333 diameter bullets. These days of course necking to .338 would be the choise to make, as there an excelent selection of .338 bullets made today.
Keith claimed all kinds of velicities with that cartridge and claimed tri-plex loads were the way to get them.
I experemented with that round for several years, and in the 70's when i bought my first chronograph i confirmed what i already knew. You just can't get what Keith claimed out of that capicity of a case!!
Anyway, it is a pretty good big game round if used as it should be. I took (13) big game animials with my .338-06 the first 3 years i hunted with it, includeing brown bear, moose, caribou, deer and ect....
Drilling Man