I sprang for a couple of El Paso Saddlery holsters for mine. It's that good of a gun.
Terrific item for a backpacker who doesn't have to worry about bears. I think it'd take a cougar with Plus P SWC HP ammo, but wouldn't seek the experience to find out.

But professional hunters take cougar (treed ones) with .22's! With lighter loads, it kills small game well, for the pot. Of course, it has the power for any snake found in the USA, unless you encounter one of those pythons in the Everglades. Would probably work on them, too, with head shots.
The M-60-4 is a superb little gun. I am baffled why they changed it, although I guess they felt a need to compete with Ruger after the SP-101 came out in .357. But the Ruger is better suited to that level of power.
By the way, the factory told me that the M-60-4 is Rated for Plus P use. There are some heat treatment differences from older M-60's, and I think the cylinder retention is different, too. But I think a routine diet of standard loads is better, unless you need Plus P for a particular use.
I have Pachmayr Presentation Compac grips on mine, and recoil from Plus P's is quite reasonable.
T-Star