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JustBen
11-30-2014, 08:40 PM
So I'm fairly new to the WSM game. My brother in law has had one in 270 for years, and I have reloaded for it, but never spent much time with load development. So when I got a good deal on a 270 WSM, I decided to go for it. Now I have a good supply of brass and other components, but I'm wondering about powder.

The WSM case is quite a bit different, and from what I can find, it runs higher pressures. I'm mainly loading IMR 4350 and 4831 these days. I've also got some H4831SC and varget in my collection too.

What has everyone been finding for the best powders to run in the WSM? I'm probably going to run mostly 130-140 grain bullets. I want repeatability and accuracy! I'm not out to bust any velocity records.

stevesummit
11-30-2014, 09:14 PM
I loaded some 300wsm for a buddy and we used rl19 and he got steller results with it

Strewth
11-30-2014, 09:42 PM
I loaded some 300wsm for a buddy and we used rl19 and he got steller results with it

This is what I tried first in my 300WSM and found no need to change it:). Apparently a good all around powder for this calibre of bullet, but that's Interweb heresay, so...
No help for your 270wissum though, sorry.

stevesummit
12-01-2014, 06:50 AM
Rl 19 is in the same area for burn rates as you listed there , so if you can find some it would be worth a try . The key word is if you can find some tho

road kill
12-01-2014, 07:17 AM
I like to use Hodgdon's web site, i look for several powders that give top velocity for powder burned. I have most of the powder makers web sites in my favorites list.

Rory McCanuck
12-01-2014, 01:59 PM
I think Varget might be a bit fast, but all the others should work well.
Everything that works in a 270 should work in the WSM, but you can stuff a bit more in.
I've had great luck with IMR 4350 in everything I've tried it in, but I haven't loaded any WSMs.

JustBen
12-01-2014, 08:01 PM
I'm going to start with the 4350. I will see if I can find a pound or two of RL19 as well. I think the local hardware store has some.

DaleJ
12-07-2014, 02:05 PM
Depending on your twist rate the heaviest bullets will run on Retumbo. 4350 is a good start.

Biggunners
12-28-2014, 06:01 PM
Missed this post for some time.

H4831SC the best of both worlds. Start from some where 60 gr for 150 gr bullets.
I load 270 WSM upto 65-68 gr behind 165gr Nosler Partitions.
Load upto 75-78gr for 300WM behind 180 gr Partition but that different game.

Check the Chrony and pressure signs, you would love H4831

Don't try Varget in Short Mag.