That's no five-inch barrel. Measure from the cylinder face to muzzle. Some of the barrel is in the frame! The gun looks sound, but is NOT in NRA Excellent condition. The bluing wear at the muzzle alone suggests about NRA Very Good condition, and the poor photo may be hiding more finish wear or a brownish patina. I hope it's still mostly a nice deep blue. Barrel length is six inches. There's an outside chance of 6.5 inches, which would make the gun a pre-WWI item. Based on what I see of the extractor rod head, I think it's from the 1920's or '30's.
If the sights are original, that's a Military & Police Target model, which evolved into the Model 14 Masterpiece by 1957. It is probably very accurate...if you are! It's an ideal gun to learn marksmanship skills with.
The Pachmayr grips are excellent for making the gun fit most hands better and for reducing the amount of felt recoil. But take them off at least a few times a year and oil underneath, on the frame. Otherwise, trapped moisture can rust the gun frame. Pachmayr is a registered trade name, and is capitalized. The firm was founded by August Pachmayr, a German immigrant, I think. For decades, it was made famous by his son, Frank.
S&W do not recommend using Plus P (higher pressure/velocity) ammo in guns made before 1957, when model numbers appeared, and then only in STEEL (not light alloy) frames. Your frame is steel. But it was made before WWII, and later guns had improved steels and heat treatment for added strength. Standard velocity or target ammo with wadcutter bullets is fine.
Plus P ammo is meant to kill things better, not needed for cans. Sure, you can shoot cans in the desert, but clean them up after. And don't shoot at glass bottles. Plastic pop or water bottles are okay, as long as you remove them. Don't shoot at cactus blades or leaves without checking to see if that's now an environmental crime. I'm serious about that.
Everything is so PC today, and many species of cactus are now protected. Also, don't shoot at horned lizards/horny toads.
Bear in mind that some species of rattlesnake are also now protected by law. I don't want to see you turn up on one of those Animal Planet shows where park rangers and game wardens arrest people or write expensive tickets for shooting at things you didn't realize are now forbidden targets.
Also, although guns can now be carried in national parks in some states (with a concealed carry license), you may not be able to fire the gun there. Check on that. I hope to gosh that no park ranger zealot would file charges for discharging a gun in a park if you have to use it in self defense...