Smith & Wesson Model 66 Combat Magnum 357
Depends on what ammo and your intended use.
For SD where you want fast repeat shots, the .357 magnum is an experts round. That’s true for pretty much any .357 revolver, not just the Smith K-frames.
I can pass various standard drills (like the Wizard Drill, or Revolver Super Test) with a Model 66 shooting magnums, but my EDC is still a .38 Spl.
Now if you mean is recoil tolerable in general, yes, with the right grips.
When I head out to the boonies, it’s with a 4” M-66 or 3” M-65 and full-house magnums to handle 2 or 4-legged vermin (the latter being mostly feral hogs.)
The Uncle Mikes that used to be standard on K-frame round-butts are hands down THE BEST. All of my K-frames wear them.
Here they are on my carry M-64:
The factory grips on the current 66-8 look like they should handle recoil pretty well, too.
The old wood factory target stocks are OK for single-action slow-fire, but too thick for my hands for DA shooting.
I’ve found with hard-kicking DA revolvers, wood stocks thin enough for my stubby fingers are very punishing. Shooting magnums with them will lift skin from the web of my hand pretty quick.
Oh, as to your question: I own 3 M-66s and have had as many as 5 in my safe, if that tells you anything.
The holster pictured is a Lobo leather offset belt clip for EDC. I carry a 3” M-64 AIWB and occasionally a 2.5” M-66.
My 4” guns are carried 3:00 in a Safariland 568 or Garret Industries Silent Thunder OWB, through I’m not crazy about either one.