Ask if possible ...I don't know why you couldn't use them. Western at one time loaded a 300 grain bullet.
Agreed -250 is all you need. If you want to shoot 300grain it would be fine however I’d simply use a 375HH.Woodleigh makes 300 grain bullets, and swift makes a 275 A frame. I don’t see what either would offer over 250 grain Swift A frame.
Exact..There are bullets made now that are 265 grain, 275, 280, 285 and 300. Barnes says that the 280 LRX will stabilize in a 1:10 twist, which surprises me since the bullet is 1.864 inches long. The old 300 grainers I shot were RN, cup and core, and of course much shorter. Lots of good advice above, but the best reason to shoot these bullets in any 338 is simply because you want to..............FWB