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338/300 RUM powder choices

 
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  #1  
Old 01-19-2010, 05:11 PM
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Join Date: Nov 2008
Location: Eastern Montana
Posts: 269
338/300 RUM powder choices

Can someone please tell me the pros and cons of each of these powders I am considering for a 338 /300 RUM? COAL is long at 3.965 and I am using FED215GM primers. Little temp sensitivity and low ES are important (obviously) but so is velocity and I was wondering if one of these powders is better than the other. RL25 and US869 are on all of the shelves around here but the H-1000 and Retumbo are rarely seen. The gun has a 30 1:9.5 twist barrel. I know the common load is 92.0 gr of H-1000 but I am looking for some alternatives as well.

RL25
H-1000
Retumbo
US869

Are there any other good powders for this thing?

Thanks.
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  #2  
Old 01-19-2010, 07:25 PM
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Join Date: Apr 2009
Location: South central, Oregon
Posts: 81
Re: 338/300 RUM powder choices

I shoot 90 gr. RL-25 for 2,810 fps, 30" barrel, Remington brass, Fed. 215. 300 gr. Lapua.
Mine don't like H-1000 or retumbo. 100 fps. slower and smokey.
My E.S. is 3 and my S.D. is 1. I shoot 15 shot strings over chrony, letting it cool for 5 minutes after 3 shots.
Tried the Fed. 215 M and E.S was all over.
US 869 is very temp sensitive! up to 200 fps. from 30* to 90*.
Have had good luck with RL-25. Not to temp. sensitive. at least not with my set up and low E.S.
Good luck!
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