Not bad, but more than the .348. H> Johnson's .450 Alaskan on the 86/71 platform, drove 465gr. at about 1,950fps t0 2,33fps & 500gr. Hornady at up to 1,880fps & similar vel. with cast bullets.
My .458 Alaskan in a model 70 Winchester, ran 500gr. Hornady's at 2,250fps & 400gr. Barnes at almost 2,500fps. It kicked me too hard. Didn 't like that at all, so cut the threads off and re-chambered it to .458 2". 400gr. at 2,150fps was much nicer shooting. Then, I sold it to my buddy Keith, for guiding.
The case capacity of the .450 Alaskan is approximately 7gr. more than a .458 Winchester.

The .50 Alaskan ran Harold's 450gr. at 1,900s'ps. .485gr. LBT at 2,009fps with IMR4198 & up to 1,892fps and 450's at 1,994fps with Re#7.

Harold made his own .50 cal. 450gr. custom bullets be sectioning 750gr. .50 Browning bullets, then reversing them, shooting the then truncated cone cup-point jacketed steel core on brown bears. Harold noted they created cavitation as well as penetrating the full length of a brown bear.

The free recoil of the .50 Alaskan in the model 71 was something over 55fpe, which is in the realm of a normal .458 Winchester rifle, perhaps slightly more with full power loads.

So, Art, if the .348 isn't "enough" gun, there are other options for it.