Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


.338-.378 KT info?

LinkBack Thread Tools Display Modes
Old 09-13-2010, 09:56 AM
Junior Member
Join Date: Sep 2010
Posts: 15
.338-.378 KT info?

Does anyone play with the .338-.378 Keith-Thompson? Came across a rifle chambered for it, and I'm trying to learn a bit about it- good, bad or otherwise- before I invest much time or money. Also looking for dies to reload for it.
Reply With Quote
Old 09-13-2010, 01:10 PM
Gold Member
Join Date: Jun 2010
Location: Bakersfield, Ca
Posts: 554
Re: .338-.378 KT info?

The .338-.378kt was the wildcat the the. .338-.378weatherby was based off of. Pretty much identical other than the shoulder dimension. Should outpace the edge and lapua by a couple hundred fps. Midway stocks rcbs dies for them if I am not mistaken.
"I'm interested in rifles, but only accurate rifles are interesting". Col. Townsend Whelen
Reply With Quote
Old 09-13-2010, 02:19 PM
Junior Member
Join Date: Sep 2010
Posts: 15
Re: .338-.378 KT info?

Whay is the best way to get brass for such a thing? Can you modify the factory weatherby cases, or would I need to start with fresh .378 cases? How are these things for accuracy? I understand that the velocity may be impressive, but will they go where you want them to? I'm guessing that a 30+ inch tube would be required for this to perform?
Reply With Quote
Old 09-14-2010, 02:07 PM
Platinum Member
Join Date: Jul 2004
Location: SW MO
Posts: 1,145
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!
Lefties are the only ones in their right minds!
(and I ain't talkin' politics!)

NRA Life Member
Reply With Quote
Old 09-14-2010, 03:40 PM
Platinum Member
Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: .338-.378 KT info?

If you are looking for a big 338 the wildcats off the 378 wby case with the shoulder pushed forward and changed to the standard shoulder do very well. Also look at one of the 338-416 Rigby wildcats. If you are doing a custom big 338 these are the tops and will exceed the lapua and 338-300 ultramag that some on here call edge and several other names by up to 300 fps. I have seen them exceed 3200 fps with a 300 grain bullet and 30"+ barrels.
Predictions are difficult, especially when they involve the future
Reply With Quote


Thread Tools
Display Modes

Similar Threads for: .338-.378 KT info?
Thread Thread Starter Forum Replies Last Post
need 6.5 stw info plumber bob Rifles, Bullets, Barrels and Ballistics 0 02-01-2011 10:18 AM
6.5-06 info jimbothepunk Reloading 7 10-30-2010 01:33 AM
6.5 stw info plumber bob Reloading 1 08-20-2010 06:51 PM
6.5 STW info please! J.J.H. Rifles, Bullets, Barrels and Ballistics 6 04-10-2007 07:02 PM
Need a little info Ian M General Discussion 12 02-22-2007 07:47 PM

Current Poll
Do You Think Slingshots Should Be Legalized For Hunting Brown Bear?
Yes - 47.11%
906 Votes
No - 52.89%
1,017 Vote
Total Votes: 1,923
You may not vote on this poll.

All times are GMT -5. The time now is 03:55 PM.

Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC