I am planning on working up a load with R19/129gr LRX in a 24" barrel .270 Win. I have used R19 in the past for two .240 Wbys and it was perfect ( 54gr/90x or 95 NBT_) Has nyone used R19 in an '06 sized case in really cold weather? did it lose much/any speed and did it change your zero? I know I can get good speeds/etc from H4831sc and other known/marketed Temp stable powders, but R19 can get some serious speed w/o alot of pressure. Any help anyone? Thank you ahead of time!

Had better luck with RL 22 in a 270 Win / 130 gr.

I just got this rifle home after being tweaked at the smith. I don't know what it will like yet. I have had a couple other 270s and one 280 that didn't care for R19 either. I would pick up a 1# bottle of R16 when I see one...so far, just an 8# jug for about $230! Ouch...for a powder I don't know my rifles will like, ha.
I had R22 (61grs) in a 280 AI that did swell here in Utah and Wy, but around 77 deg, down in Texas, it almost locked up the action! And yet, I used 76gr R22/300WM/180 Barnes in SA & Namibia with no issues. In Namibia it was 20 deg at night and 120 deg at noon! No issues with pressure nor bolt lift or zero! go figure!

Can't answer your question about RL19 and cold weather.
I will say my experience with RL19 in .270W with 129, 130 and 145 gn bullets was disappointing ( two different barrels ).
What works for me is H4831sc and RL23 and they are very good.

With accuracy loads I had the highest velocity with 150 grain in the 270 and also 180 grain in 300 Winchester than I have ever had.

Same tin of powder used.

Did not use it again Re 22 was far more widely available in Australia.

I have used 61.5 Gr of RL 22 behind a 130 gr Nosler partition for as long as I can remember (Texas, New Mexico, Alberta) with extremes of 100F-20F with no issues in 4 different bolt rifles.
24" pipes yield about 3250 FPS and 22" a little over 3200 FPS.
I have never looked back for hunting deer out to 400 yrs. Probably would not shoot beyond that range anymore but....
Very accurate load in my rifles. Win brass and Fed 215 primers.
It would be a max load. I would start a couple grains lower.

Thanks guys. I haven't used R22 in years. last rifle was my .224 TTH ( 22/6mm Rem) but it was stable in it. I have some lft of a 20yr old 8# jug...I actually loaded the 140NAB/270W for a gift rifle to my returning Marine SIL's .270W.

Jim, what twist does your .270 barrel have? The 129-gr LRX is 1.344" long and would be on the ragged edge of stability in the 10"-twist found in most .270s.

Mine is 10", but its a 24" barrel, hopefully I can get it fast enough to stabilize OK to 350yds or so. I don't shoot past that. My "average" distance on elk out here is 190yds, and 75yds for mule deer, ha. Never shot a coyote past 300 either. A friend in Co. has shot the 129LRX/59.5 R19 load in his 24" Mod 70 EW just fine. Hopefully I'll find out this Saturday...if the Range is opened!

I found a couple pounds of R16 online for a reasonable hazmat fee, at least what I was willing to do, ha. I am definitely going to try it with this 129 LRX. After letting the 59.5 gr sit overnight under the 120 LRX load (slightly compressed), I pulled the bullet and "bingo" moderately "caked". Well, I am just too OCD for "that again", ha. I'll pass for now. It may not mean anything, but the poor performing load back in 2002, in my 338WM, was also "caked". As my youngest grand daughter use to say..."No want"! ha I have plenty of H4831, H4350, R23, R26 (its fine in cold, but my best load got wonky at 80+ deg.) StaBall. No use to torment myself, ha

If RL-22 works, then you can bet RL-19 will also. much like if 4350 words so does 4831, powder weght will vary a bit..As to compaction, its not a problem with either RL-19 or RL-22, Ive used both in my 30-06, 338 and .270, but if the compaction bothers you then use H414..A certain amount ofcompaction is the road to accuracy in a lot of cases.

The .270 has allways been a marriage with 4831 however, but 4831 in any form cuts grains and is a pain to load..I have a lot of old WW2 surplus in great condition, the stuff that Jack used and it still gets more velocity and considerable less pressure than any of todays powder, and its accurate with a full case..I just don't use it anymore as the new RLs are super accurate and flow thru a powder measure with scale accuracy..H414 being one of my all time favorites in the 270, 7x57, 8x57, 250-3000, and 06 and its showing good in my new 8mm/06 Ackleu IMP..

Thank you sir, I appreciate the posts guys.

I hope to get out to the range this Saturday, I'm using some Sierra 120PH/N165 for a sight in load. I like this bullet as it shot right with the Barnes 110 TTSx in the last two .270s I had.

i have always stuck with H4350