270WSM powder recommendations?

brotherjack

brotherjack

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So, after years of shooting old-school stuff (303 Brit and 308 Win), I finally wound up with a rifle chambered in a "modern" cartridge to extend the reach and shoot flatter -- the 270WSM.

Anyway, I went over to my buddies house who has quickload, and if the software is to be beleived - to get a 100% to 105% case fill, and good velocity at sub-max loads (I'm only looking to go about 59k/psi, though I might work up to a little more than that, depending on what's best for accuracy) it looked like any of the following would probably work pretty well:

IMR7828 (or SSC, depending on how hot I wanted to go)
Reloader 25 or Reloader 22
H1000
H4831

Anyone have any suggestions as to one, if some or all of the above powders would be reasonable choices for some place to start load development, or two if you have some other pet powder you feed your 270WSM that gives you some spectacular accuracy.

I am way more interested in accuracy than velocity (though hey, faster bullet were the idea behind getting a 270WSM - so at least decent velocity would be desireable).

Thanks,
 
Ramshot Mag is another good choice, it was the only powder that produced the velocities that I expected to get out of my 270WSM
 
Just curious - tell me more about your experiences with Retumbo -- I didn't have it on the list, as QuickLoad indicated that with all the Retumbo you can fit in a 270WSM, the pressure was just barely over 50,000PSI with relatively low velocities. ??? I don't entirely trust the software mind you, that's why I'm asking around here - so, tell me more about Retumbo. :)

Thanks,
 
Side note - I'm pretty much exclusively interested in shooting 130 grain bullets - this is going to be a 'reach out and touch something' gun for mule deer hunting, not much need for heavier bullets for that use.
 
While it's probably a little faster than ideal, my current 270 WSM load is a 130 gr. TSX over a fairly stiff charge of RL 19. The velocity is about 3220 fps, and my T-3 rifle averages 3 shot groups of about .75, although I've shot smaller groups too.
 
Scott_N said:
While it's probably a little faster than ideal, my current 270 WSM load is a 130 gr. TSX over a fairly stiff charge of RL 19. The velocity is about 3220 fps, and my T-3 rifle averages 3 shot groups of about .75, although I've shot smaller groups too.
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Just to see how accurate QuickLoad is - would that be around 65.5-ish grains of powder with an OAL of around 2.8?
 
brotherjack said:
Just to see how accurate QuickLoad is - would that be around 65.5-ish grains of powder with an OAL of around 2.8?
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I little under... it's 67.0 grs. Barnes emailed me some data a few years ago and they showed 68.0 grs. as their maximum. They've lowered their max in their new manual though, and my charge is over what they recomend now. My brass doesn't show any signs of high pressure, and judging by the velocity, I think I'm ok. I'd have to measure the OAL, but it's longer than 2.8.
 
Scott_N said:
I little under... it's 67.0 grs. Barnes emailed me some data a few years ago and they showed 68.0 grs. as their maximum. They've lowered their max in their new manual though, and my charge is over what they recomend now. My brass doesn't show any signs of high pressure, and judging by the velocity, I think I'm ok. I'd have to measure the OAL, but it's longer than 2.8.
Click to expand...

OK, maybe still not too crazy, runing out the seating depth out a bit and using that charge shows vaguely that velocity in QuickLoad -- close enough that I'd expect that the various variables that come into play between one gun and the next would account for the diff.
 
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