Re: .338-.378 KT info?
The 338-378 KT was designed by Elmer Keith and Bob Thompson in the 1960's as a long range elk cartridge to be used with 4831 (I believe Hodgdon) powder, as it was the slowest powder available at the time. They kept the Weatherby double radius shoulder but shortened the case 1/4" to better suit case capacity to the burn rate of 4831. Performance mirrors the modern 338 RUM. Case trimming and forming dies are required to form brass. 378, 338-378 and 30-378 Weatherby brass would all be suitable for case forming. It was an awesome round in its time and still is but the question is whether you want to spend the time and effort to make cases for a round whose performance is duplicated by a modern round. Definitely high on the cool factor, though!
Leftys are the only ones in their right minds!
(and I ain't talkin' politics!)
NRA Life Member