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270 Win 140 gr bullet load ideas

 
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  #1  
Old 06-02-2010, 11:33 PM
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270 Win 140 gr bullet load ideas

I've been shooting 58 gr of H-4831sc and 140 Accubonds which is a max load in Nosler's book. Velocity is only 2840 out of a 22" barrel.

Is there a better powder for this bullet out of a short barrel? Any good powders to try with 150 Bergers and a short barrel?

Thanks.
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  #2  
Old 06-02-2010, 11:43 PM
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Re: 270 Win 140 gr bullet load ideas

Quote:
Originally Posted by montana_native View Post
I've been shooting 58 gr of H-4831sc and 140 Accubonds which is a max load in Nosler's book. Velocity is only 2840 out of a 22" barrel.

Is there a better powder for this bullet out of a short barrel? Any good powders to try with 150 Bergers and a short barrel?

Thanks.
Let's do some calculations:

How much velocity increase per inch of bbl beyond 22: Lets say 20 FPS, just guessing, but reasonable.

27" bbl, 58.5 RL-22 = 3190 FPS MV with the 140 NAB.

5" shorter barrel = 5 X 20 or 100 fps mv loss or 3090 FPS out of a 22" bbl.

Switch to RL-22, learn to live with the temp. sensitivity and don't look back. Use Non Magnum primers also (CCI-200 are a good choice)

PS: Whoever said 4831 is the powder for the 270 Win either passed away before more powders were available or should be locked up!

60 grains of the stuff would break 2900 fps by much, if any, out of a 24" bbl.
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  #3  
Old 06-02-2010, 11:58 PM
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Re: 270 Win 140 gr bullet load ideas

RL-19 or RL-22.
Have you tried H-4350? Roy is gonna hate me for this but I like IMR4831 in just about anything I shoot. (338wm down to 30-06) It seems to be the ''leatherman'', or a ''do all'' powder if you will, but it sure doesnt give the velocity of RL, and some others.
I switched from IMR 4831 to RL-19 in my 270wsm and 140gr Accubonds and got alot more speed and a little more accuracy. Win/Win situation.
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  #4  
Old 06-03-2010, 12:51 AM
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Re: 270 Win 140 gr bullet load ideas

montana native,

I'll not hate what winmag said (he's always raggin' on me about somethin' ) as he is correct. 4831 just doesn't get the velocity that other powders do.

The disappointing thing is that back in the day when 60 gr 4831 was booked at 3012 with the 130 class bullet, I shot tons of mule deer, chucks and coyotes at all kinds of distances for many years.

I then bought a chronograph and was really bummed that I was barely breaking 2900 MV. The rifle be came suddenly useless. Once I got'r stoked up to proper velocities I was a happy camper again.

Back then Norma 205 (which is RL-22 that is swept off of the floor where 205 is made thus the temperature sensitivity) was what brought the velocity back.
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  #5  
Old 06-03-2010, 07:50 AM
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Re: 270 Win 140 gr bullet load ideas

Thanks for the info. I wonder how RL-17 would work. I've got some RL-22 I will try. It would be nice to pick up another 150 fps or so. I guess I always thought the short barrel was what was killing velocity not the powder.

Thanks again.
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  #6  
Old 06-03-2010, 07:56 AM
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Re: 270 Win 140 gr bullet load ideas

Not necessarily the first thing that comes to mind but try some R17 or Magpro if you have it, I've put them in some cartriges that aren't what you would think of it for and have it work great, specially with that stub barrel.
Our 270 win's go to powder is 7828 but that may be way to slow for your short barrel.
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  #7  
Old 06-03-2010, 11:41 AM
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Re: 270 Win 140 gr bullet load ideas

Ive been having really good luck with 140gr Bergers with 59grs of H4831 with a BR primer and RP brass. 2971fps +/- 4fps 82*
No pressure signs in the least, im working on a .2grain increase till i see pressure signs. Gotten up to 59.6 and the groups arent doin so great so im goin back to 59.

R700 SPS 24" barrel
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