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Reload .338-.378KT for Nosler 250gr w/Retumbo

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Unread 08-25-2011, 08:32 PM
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Join Date: Mar 2010
Posts: 80
Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

Thank you, RDM, this is very helpful. I will start out with less powder and look for signs of stress and Crono at the same time.
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Unread 08-26-2011, 05:10 PM
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Join Date: Jul 2004
Location: SW MO
Posts: 1,342
Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

Originally Posted by terjeness View Post
Thanks to both Sambo and Backwoods!
As I'm looking at Hodgedon's data, it startes (for the .338-.378Weatherby) with 108gr and goes up to 115gr. However, I am considering starting with 105gr and work my way up from there.....
I would NOT do that!!!!!!!!

The 338-378 KT mirrors the performance of the 338 RUM and that would be an over max charge of any powder in the RUM. The KT was based on the 378Wby (back before there was a 338-378 Wby) and the whole case, shoulder and all was shortened 1/4". If you line up a 338-378 KT case next to a 338-378 Wby case, you would see this.

I'll dig around this evening to find the magazine with the load data.
The critters have to win every time, I only have to win once.

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Unread 08-26-2011, 05:54 PM
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Join Date: Jan 2005
Location: Searcy, Arkansas
Posts: 700
Re: Reload .338-.378KT for Nosler 250gr w/Retumbo


It sounds like you better listen to Sambo, I am not familiar with the 338KT and wrongly assumed it was pretty close to the 338/378, apparently it is not. The 338Khan is close enough in case capacity that loads for it and the 338/378 are pretty much interchangeable. The loads I listed are top end pressure wise for my 338Khan so even backing off 4 or 5 grains may not be enough. Maybe Sambo can find that magazine article or someone more familiar with the KT can make some load suggestions, but don't try my 338Khan loads. Sorry, my bad.
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Unread 08-26-2011, 08:31 PM
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Join Date: Mar 2010
Posts: 80
Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

Thanks, guys. I appreciate your advice. I have shot this one in the past with 101gr. 4831 w/250gr. Sierra Spitzer Boat Tail. But do not have the velocity any longer.
F. R. Mitchell in a Champlin ARms Keith Grade rifle with a 25" barrel shot a 250gr. Nosler with 98.gr. RL22 at 3000f.sec.
However I do not have any data with Retumbo yet.
I have loaded up some loads starting at 99gr. in 1gr. increments. Will try tomorrow and look for stress signs as I go. However, despite Retumbo being temp stable, I am a little concerned with the hot temps now. It will probably be 20Celcius or more tomorrow morning.
If you find any more info tonight, I'll be very curious,
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