I have a Win M70 CRF Alaskan in .338WM. Haven't played with it much. Used to have an older style Win 70 in .338 (jeweled bolt style) which I ended up cracking the stock on. Shot too many heavy loads through it I guess.
The most accurate loads in my old rifle were with Sierra's 250gr btsp. I had shot various bullet weights from different manufacturers e.g Barnes, Hornady, Sierra, & Speer.
1st load (according to my notes that I did on my typewriter way back when) was 64.6gr's of IMR 4350, CCI 250 primers, WW brass, velocity was around 2500fps. Grouping at 100yds was 1".
2nd load was 70.2gr's of IMR 4350, CCI 250 primers, WW brass, velocity was around 2700fps. Grouping at 100yds was 1.3"
Heavier bullets were more accurate at min to mid-range velocity than zipping them out near max charge.
H4350 performed pretty well also with almost identical results.
Hornady SST's or GMX's didn't exist when I had my rifle. Would like to try some in my new rifle.