The only load I use in my 338 now is 77gr of R-22, mostly with the 225gr Hornady, but also with the 225gr Barnes xlc. Soon I'll be trying the same load with the Barnes 225gr TSX.
JMeier

I've had very good luck with both RL 22 and IMR 4350. However, I seem to get the most consistant accuracy with the IMR 4350 and Barnes TSX bullets.

Geronimo

225 Nosler AccuBond
Rem. Cases
CCI 250 Primer
70.5 gr. IMR 4350
COL 3.35
Velocity- 2827fps

Very Accurate in my gun.

RL-25 From 71.1 grains to 76.5 grains
Remington 9-1/2M Primer

Thunderstick:
For me it's Rldr-22 and 225 gr. Northforks. Couldn't get consistant accuracy with any of the 4350's. I don't know about ignition problems in colder temps. since just about all of our seasons are closed by the time it's cold enough to make a difference. I never worry about it. BTW, I really pay attention to seating depth. Bear in Fairbanks

I've had great success with RL-19 and with Swift 225, H-414. jorge

I've only tried 2 powders in my .338 Tikka - RL-22 and IMR-4350, and with 225 gr Hornadys and Barnes' X-bullets. Both shot very well and groups with either were under 3/4-inch. I will have to chronograph the two loads to decide which one to use.

Try IMR-4350 first, RL-22 second, RL-19 and all the others 3rd.......DJ

I am working up a load in a friend's rifle and chose to start with RL22. If this does not produce good results, then I will try some of the other options listed here. In the 270 and magnum size cases I have always found RL22 to be superb and have never had a problem with temperature sensitivity even in subzero weather.
I was just curious what the consensus was here as I never worked with a 338 before and it seems as though RL22 is a good place to start. The bullet will be the 225 Hornady.

I like Reloder 19. 72gr gives me excellent accuracy with Barnes 225gr TSX.
Cheers
Allan

Reloader 19 is really a great choice with 225s, as is IMR 4350.

AD

Using a 225 grain bullet, what powders have worked best for you in a 338 win mag?

While a lot of magazine articles and posts on the internet suggest RL 22 is the best choice of powders with the .338 Win Mag and 225 grain bullets, that's not the case in my rifle.

I got the best accuracy and most consistant velocity on my chronograph when I used H 4350. I found that I got very good groups and velocity using H 4350. My rifle shoots the 225 Nosler Partition well under an inch any time I do my part.

I used Winchester cases and Federal 215M primers.

Some folks do not like the 225 grain bullets, but they work for me. The elk and wild hogs I have shot with them have all been impressed.

R F

If disparity in temperatures isn't a problem in your load development and ultimate shooting, RL22 without fail has worked best through a broad range of rifles for both the 225 and 250g bullets. Its problem is that it is very temperature sensitive. Between 74g and 78g of RL22 and standard rifle primers, has been by far the most accurate loads I've used.

In the temperature tolerant propellants, both H4831 and H4350 have given superb accuracy though top velocity is somewhat less than with RL22. I've also worked with one rifle that did best with N160 behind 225's.

RL19 & H4350 have been the most accurate in mine. H4831sc gives good accuracy & the highest vel. I'm just trying RL22, we'll see.