.375 Chey Tac Powder Options

[.375Mojave]

I have a .375 CT improved with a significant case capacity increase and I am looking for some powder options.

I am currently using Retumbo but even with 140 gr I have a lot of reserve capacity and would be interested to try a slower burning powder that would come closer to a 90%+ capacity load.

VV M170 has already been eliminated from the list. It is slower burning according to the charts but I am told the results were not as good as Retumbo.

Has anyone done much with the H50BMG in a 375 CT?

Anyone have any other suggestions?

 

[Dogtown]

Re: .375 Chey Tac Powder Options

I've used RL-25 extensively with mine but I start to get compressed powder around 130gr.

 

[.375Mojave]

Re: .375 Chey Tac Powder Options

Is it a standard 375 CT?

 

[ggarrett1911]

Re: .375 Chey Tac Powder Options

How about US-869? I never got around to trying it in my old standard 375 CT, but I know steve123 on here ran some of it for a while. You might PM him and see what he has to say.

 

[steve123]

Re: .375 Chey Tac Powder Options

.375Mojave,

I've tried US-869 in my regular 375CT.

Max load with a sticky bolt was 151 grains with the Hooker 350's. 147-148 grains seemed about right.There was a gain of over 100 fps with US-869 compared to the R-25,around 3200 fps.

It provides good load density and ignited better than most powders but might be sensitive to temperature?That's what they say anyways.

Steve

 

[Marriedman1]

Re: .375 Chey Tac Powder Options

By all indications the 50 BMG looks good but have not tried it yet. I have a buddy using it in a 338-408 with good results....anybody got some give it a try and post results

 

[.375Mojave]

Re: .375 Chey Tac Powder Options

How did the US-869 group as compared to the R-25 and/or Retumbo?

I might try to snag some of the US-869 and the R-25. I have a lot (maybe too much) case capacity and while Retumbo seems to have a good reputation, even at 144 grains I am a little low on load density. It may be OK but I would like to experiment a bit with some other powders to try and fill this monster up.

I have yet to get pressure signs (sticky bolt, flattened primers) even from 144 gr of Retumbo so I still want to push that a bit but so far accuracy seemed to drop off after I got above 140gr of Retumbo. It could improve as I push the limit. I have had guns/loads that grouped best at max and others that were most accurate with a 3% to 5% reduction.

I appreciate the feedback guys.

 

[steve123]

Re: .375 Chey Tac Powder Options

I had too much R-25 around to shoot up first.IIRC it was the same accuracy as R-25.

Steve