The 333 OKH was developed by Charles O'Neil, Elmer Keith, and Don Hopkins in 1945. It is the 30-06 case necked up to accept .333 inch diameter bullets. At the time the cartridge was developed, .338 inch diameter bullets were not generally available, but .333 inch bullets were. When the 338 Winchester Magnum was introduced in 1958, a wide variety of 338 bullets became available which led to rifles being made for the 338-06 cartridge. The difference between the 333 OKH and the 338-06 is miniscule and one can use loading data interchangeably. However, the two bullet diameters are not interchangeable.
The 333 OKH was a very good cartridge during its time, but now it is obsolete.
Source: Cartridges of the World
|333 OKH Reloading Data|
|Bullet (grs.)||Powder / (grs.)||MV||ME||Source|
|250||4350 / 62.0||2400||3200||Ackley|
|275||4895 / 45.0||2202||2960||Ackley|
|275||4831 / 57.0||2314||3270||Ackley|
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