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.300 RUM + US869 + 240SMK load dev quandry

 
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Old 05-04-2009, 10:05 PM
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Re: .300 RUM + US869 + 240SMK load dev quandry

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Originally Posted by jmden View Post
Sounds like you're stuck. Might try the 215's as suggested.

I've seen 869 recently listed as an extreme powder on their site, but I don't think it is. I've burned through 8 lbs of it (and a barrel ) shooting 240's and 200AB's in the 300 RUM. I try not to shoot in temps above about 50-60 as I've noticed the velocities take a 50fps or so jump at that point.

Right now I'm shooting 104.2g for MV's just under 3K (~2994 or so) with fed 215M's and on the lands. Might be a bit more capacity in my case than some as I use a Redding comp shellholder of +.010 to get the fit I want and am shooting with the 240 on the lands using the 4" Wyatts box. ES is ok at right around 20 fps if I take out the lowest and highest velocity in the string first.

Good luck.
Yeah, I'm worried I might be stuck as well, unless I can find some Fed primers and they do something magical.

Trying to understand what you gain by dropping the high and low values when looking at your ES... seems if ES is the value is what you are interested in, then the high and low values are the most valuable piece of information; unless you don't trust the consistency of your chrono or something. Just curious
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Old 05-04-2009, 10:17 PM
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Re: .300 RUM + US869 + 240SMK load dev quandry

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Originally Posted by trueblue View Post
What were you shooting before to get tiny groups, and stupid low ES, and if it shot so well, why change a good thing ? Did you go up in weight of bullet, or something else specific.
Just that the velocity is in the mid 2700 fps range... if I can have the same cake up around 3000, I'll eat it... More energy, shorter t.o.f., less wind drift, flatter trajectory, etc. 8+ percent improvement is nothing to sneeze at!
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  #10  
Old 05-04-2009, 10:35 PM
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Re: .300 RUM + US869 + 240SMK load dev quandry

"don't trust the consistency of your chrono or something" bingo... No screens, not mine, changing lighting conditions at a range where I have little control over the chrono. Do the best I can when I'm there. Have had pretty consistent luck doing this over the years and using the MV average I come up with. Need my own chrono. Purchased a CED M2 last year and it just did not work--to put in nicely. Others seem to have had good luck with theirs...
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  #11  
Old 05-04-2009, 10:41 PM
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Re: .300 RUM + US869 + 240SMK load dev quandry

Ah, gotcha... makes more sense to me
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