I have a 11 inch 338 KraZy Ivan(338 x39) built by LRI. I'm running 300 SMKs at 1050 fps.
Very quiet with my Sig 338TI can.
Last night,I put together a Remage 9x39 9 inch bolt gun. The factory Wolf ammo is a 278 gr Sub.
Look forward to poking holes in bacon with both