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

 
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  #1  
Old 08-23-2011, 12:38 AM
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Reload .338-.378KT for Nosler 250gr w/Retumbo

I hope there are some seasoned wise guys (in the best sense of the word) out there who can give me some reloading data for my 338-.378KT. I want to try Retumbo and 250gr. Nosler Spitzer bullets. I'm also considering the Barnes TSX 250gr. Anyone with experience to share?
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Old 08-24-2011, 07:07 PM
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Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

338x378wby improved or kt use a couple grains less that max for a 338x378wby mag and H1000 may work better, I don't know a whole lot about em, just what I've been told. I know basically that kt is just the initials of the designers but what I mentioned should be a good starting point.
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Old 08-24-2011, 10:21 PM
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Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

Thanks, Backwoods, for your reply!
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Old 08-25-2011, 03:53 PM
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Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

The 338-378 KT (Keith-Thompson) is a 338/378 Weatherby case shortened by 1/4", so it will have a fair amount less powder capacity than the parent cartridge. There was an article on the 338/378 KT written by Ross Seyfried in Shooting Times back in 1985 or 1986. I have the magazine and if I can find it I'll post the data. I don't think it would be a good idea to use 338/378 Weatherby data and back off a couple of grains. That might still be too much powder. More realistic might be 338 Remington Ultramag data but I don't know that for sure.
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Old 08-25-2011, 04:05 PM
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Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

What I found on it was that it is shorter but most of that is in the neck length, it still holds 121grns H2O not a noticable difference from the weatherby. The only data listed was 96grns H4831sc under a 250grn partition at 3010fps in a 26" barrel. So with that said I'm thinking retumbe may end up being compressed and still be to slow under a 250, might work well under a 300grn.
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Old 08-25-2011, 07:52 PM
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Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

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.....
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Old 08-25-2011, 08:11 PM
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Re: Reload .338-.378KT for Nosler 250gr w/Retumbo

I shoot a 338 Khan which is a 338/378 improved. However it has just a bit more case capacity than the factory 338/378 so I would think my loads would need to be backed 4 or 5 grains to start.

250 SMK / RL 25 - 107 grains / Fed 215M 3240 fps

300 Berger / Retumbo 104 grains / Fed 215M 3018 fps

250 SMK / Retumbo 111 grains / FED 215M 3230 fps

I am a fan of SMKs and Bergers, don't have any data on the bullets you mentioned. One new bullet I just started messing with is the Cutting Edge 225 grain.

This may not be my final load as I still want to play with some other powders.

225 CE / RL 25 108 grains / Fed 215M 3400 fps

Good luck, and be careful...... start low, if you try any of these loads.
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