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best powder for 270WSM 130-140gr

 
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  #1  
Old 07-21-2010, 04:50 PM
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Posts: 263
best powder for 270WSM 130-140gr

I just bought a 270WSM and plan to load 130 or 140gr bullets in it depending upon what it prefers. I want the most stable powder I can make work due to the varied conditions I will use it in. Home is 1200ft above sea level and fall weather ranges from 80 to 20 degrees. I also hunt in Wyoming at 8-9000ft at 0 degrees. Once I find a load that works here I will probably have Leupold build me a turret for each location. What would you recommend trying?

Here's what I have on hand, but I can get others if there is a better option.
H4831
H4831SC
IMR 4831
H4350
IMR 4350
RETUMBO
H1000
RL 19
RL22

Last edited by mcseal2; 07-21-2010 at 04:54 PM. Reason: TYPO
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  #2  
Old 07-21-2010, 05:15 PM
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Location: South Central PA
Posts: 801
Re: best powder for 270WSM 130-140gr

Quote:
Originally Posted by mcseal2 View Post
I just bought a 270WSM and plan to load 130 or 140gr bullets in it depending upon what it prefers. I want the most stable powder I can make work due to the varied conditions I will use it in. Home is 1200ft above sea level and fall weather ranges from 80 to 20 degrees. I also hunt in Wyoming at 8-9000ft at 0 degrees. Once I find a load that works here I will probably have Leupold build me a turret for each location. What would you recommend trying?

Here's what I have on hand, but I can get others if there is a better option.
H4831
H4831SC
IMR 4831
H4350
IMR 4350
RETUMBO
H1000
RL 19
RL22

sorry but i would go buy some more powder. The WSMs love RL17 and the 270WSM is no different. I would start with 59 or 60 grains and work up.
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  #3  
Old 07-21-2010, 05:28 PM
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Join Date: Dec 2001
Posts: 787
Re: best powder for 270WSM 130-140gr

I use R-17 with 140/150gr bullets and I would start around 55gr and work up for both max for the 130gr is 62 and around 61gr should be max for the 140. Good luck
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  #4  
Old 07-21-2010, 05:35 PM
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Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 7,996
Re: best powder for 270WSM 130-140gr

Seeing as you have a whole flock of different powders, I'd consider adding 7828ssc to the mix.

However it may be better with 150/160 class bullets than the 130/140s?????
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  #5  
Old 07-21-2010, 05:39 PM
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Join Date: Nov 2008
Location: SW Montana
Posts: 4,259
Re: best powder for 270WSM 130-140gr

I get the best results with Retumbo and the 140's and R17 with the 110's. With the elevations and temp swings your looking at I would stay with a Hodgen Extreme powder.
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Last edited by bigngreen; 07-21-2010 at 10:21 PM.
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  #6  
Old 07-21-2010, 07:08 PM
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Join Date: Oct 2005
Location: Wyoming
Posts: 343
Re: best powder for 270WSM 130-140gr

Magpro. I load this under the 140 Accubond and get great velocity and will shoot under 1/2" all day.
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  #7  
Old 07-21-2010, 07:55 PM
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Location: Redmond Or.
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Re: best powder for 270WSM 130-140gr

My pet load is 62 gr RL-19 under a 140gr Accubond, .015 off the lands with a Fed. 215mag primer.
I started load development with 61gr and loaded all the way up to 64gr, but 62 was the most accurate. Not to mention the velocities far surpassed IMR4831.

I load for 3, 270wsm's and all three like between 61-63gr RL-19 and 140 Accubonds, more than any other load combo Ive tried. All 3 are Model-70's, and all 3 shoot sub moa groups.
61-64gr of RL-19 should get you around 31-3200fps+ with a 24'' pipe depending on elevation. My rifle will shoot 64gr (89% load density) but it will only group 4 out of 5 shots sub moa, and primers are slightly flattened. With 62gr all 5 are .6'' groups, and smaller (best to date is .3, 5 shot group) and 0 pressure signs even in 96 degree heat. This is handy because I hunt the brakes of the Snake River in August where temps can soar to 115 degrees plus during August bear season. At 5000' and less, 5-600yds equals a dead elk even in temps in the minus teens.
At 8000ft+ that range extends considerably. Bigngreen has some very helpfull info on velocity, and kinettic energy at that elevation, But remember he's shootin' full throttle loads. Hammer down, and balls out, he's crankin on it(3300+fps!). Not all rifles will handle his loads without serious risk of injury to the shooter and or the firearm. He's nutts, but he knows his rifle intimately, and has worked up to his loads carefully.
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