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I personnally like the 1858 style remington.
Well, I enjoy cap and ball shooting, but that's a bit too ol' school for me. LOL!
My vote would be for a K frame 4" .357 magnum revolver IF you want to actually CARRY the gun. The GP100 is a hefty piece and you'll notice it early on IWB. A K frame 4" gun will carry much better. The trade off is durability, but my medium framed guns, a Security Six, a M19 S&W, a Rossi M971, and the two Taurus M66s I own now, have held up well with a mild diet of HOT loads and a normal diet of +P and wadcutter .38s. For me, the trade off in totability (is that a word?) is worth it 'cause the K frames are a lot more durable than some seem to think. Their rep for wearing early came from constant use with magnum loads by police departments. I doubt I'd ever wear one out in my lifetime (probably not that many years left, I'll admit) the way I use one.
Anyway, whatever the GP100 could do afield, my Taurus 4" M66 can do or a Smith and Wesson M19 or a Ruger Security Six could do. I would go with adjustable sights for the hunting and field use even though they're not that desirable for carry. That's another trade off that's worth it to me.
I've killed 3 Texas whitetails with the .357, okay, 2 were with a 6.5" Blackhawk and 1 was with a carbine (don't count here). But, the .357 is adequate for deer hunting. With a 4", I'd limit my shots to 50 yards max. I have a Contender I prefer for hunting. I cheat.
I own more'n one gun, but I think for a knock about outdoor gun/self defense combo. the 4" K frame can't be beat. I'll always own at least one. I hope I can find another affordable used Smith M19 or maybe another Ruger Security Six sometime. I traded both of 'em off. Actually, I really liked that little Rossi, too, and traded it off. :banghead: I'm going to quit doing that, dangit. That M19 was a classic with a smooth Smith trigger and that Ruger was a rugged, reliable stainless firearm with a trigger job to die for. I liked the Rossi for its smaller, lighter frame size, sort of half K, half J frame. It was only 30 ounces, great carry gun. I did limit the hot stuff in it, though. It was deadly accurate with a 140 grain JHP Speer handload. Took a javelina with it, once.