I ran a BAR 30/06 with an 18 1/2 tube and other than causing deafness, it worked fine.

IIRC, I ran 56 grains of IMR 4350 pushing a 165 gr. Partition. Muzzle velocity was a little above 2500 fps. (Basically, a .300 Savage)

In mine, the bullet didn't stabilize until it got out there a ways.

Should make a handy rifle, though it might keyhole slightly at closer ranges.