.338 Federal?

[GSPKurt]

Does anyone here have a .338 Federal? I just ordered a McGowen barrel for my LR-308 and am looking for subsonic load data with 285-300 gr. bullets.

[johndoe3]

For 300gr bullets in 338 Federal, I use 13.4 gr of VV N110--about 45% fill.

[GSPKurt]

Thank you, sir.

[Todd Is]

Sorta in the ballpark on the info request.....I cast some 200 grain bullets in my RCBS mold today..........
8.1 grains of Trailboss came to ~1015 FPS
9.1 grains of Trailboss came to ~1065 FPS

Earlier tests using 250 grain Sierra Game Kings, 13 grains netted ~ 1015 FPS.

[GSPKurt]

I should have noted that it is for a semi-auto rifle. I have also found that no subsonic load will cycle this semi auto rifle. So it's back to supersonic loads. Thank you to those who responded.

[fishman]

45 raptor would probably be your best bet for a subsonic semi auto AR10/LR308