Anyone tested this combo in sub freezing temps? Thanks.

I've used RL 19 in a 338 on a late season elk hunt in Manitoba. Temps were down around the minus 30 F every morning. Zero issues with ignition or groups. CCI 250 primers were used.

That's a good report! what temp did you work up the initial load? -16F is as cold as I have hunted in...any colder than that and I'm back at the house, ha. Now, as a soldier in Germany, early '70s I "lived and soldiered" in -40F a few times....miserable, ha.

Jim The load was worked up at various temps. It would have started at temps above freezing and continued as the temp got colder. The last check was done at about -20 deg F and the point of impact had not moved from warmer temps..
I have seen some loads that shoot several inches lower in cold weather. RL19 and CCI 250 primers in the 338 did not do this.

Thanks Snowman! I only have a small amount of R19 and probably won't use it. I was wondering if my bad experience was just the fact it was so compressed it made ignition poor or if that was normal, the loos of speed in the cold. I appreciate the reply Pard, good hunting this year!

I have used Rl22 with success.
If you are looking for temp insensitive powder, RL23 would be your best bet.
It acts alot like Rl19

Lee I think it depends on what bullet weight you are using. I like the 210 gr TSX bullets in the 338. If you were using 225 or 250 grain bullets RL 22 may be a better choice (or RL23). Staying with the lighter bullets (185thru 210) I would also try RL 17 or the newer temp insensitive RL16. It may come down to what shoots best in your rifle.

I dont change powders within a caliber.
whatever powder I choose I will use it for whatever bullet is chosen.
I used Rl22 all the way through a 338, I personally don't care about temp sensitivity, it is just what the OP asked for.
I have never had a problem with regular, or extreme powders, so no preference. Whatever shoots best.
If Rl22 will work in a 264 win with 140 bullets, it will work in a 338 with whatever.
Same case.
I have shot Rl 16..Sold it

I use RL-19 and 215 Fed. primers in my .338 and get some great velocity..Been using this load since the introduction of RL-19 and found it better than RL-22 or RL-15 with the 225 gr. Nosler partition and Accubond..My elk load these days. It also worked with the 210 Nosler partition and old favorite but found the 225 Nosler a better killer on elk.