I like single shots, simple, nothing could be simpler. They can be reloaded rather rapidly, too, with a round in the off hand. I wear a butt cuff on my wrist when hunting with my .30-30 Contender pistol, ammo is right there when I fire. The thing is so accurate, I never have needed a second shot, though. But, I can reload it post haste.
I just bought a 10 gauge H&R for goose hunting, primarily. I started goose hunting many years ago with a single barrel Iver Johnson 16 gauge. I have repeaters, but break open guns, doubles and single shots are favorites of mine. A coach gun does guard duty in my bedroom, not a pump.
I wouldn't mind a single shot rifle, but I don't own one. I think I'd go with a .45-70 before the .500 S&W if I wanted a big caliber, though. Chamber a .45-70 in a strong gun like a Ruger number one and you can push it to near .458 Win Mag levels. I really don't need such a cannon, though. My .308 is a decent hog gitter right out past 300 yards. I also have a 7 mag for what the .308 won't take care of, but I rarely use it anymore. It tears the HELL out of meat on medium sized game. Someday I'd like to go after elk or maybe a King Ranch nilgai with it.
But, that NEF shotgun has got me thinkin' about a handi-rifle. They are great values and can be made into 1MOA rifles. I don't really need another rifle, though, and mostly when I do grab one to go hunting, it's the .308 Remington bolt gun, a stainless M7 with a 2x10x40 Weaver in Millett mounts and rings. I think a Handi rifle in .22-250 would be kinda fun, but what I'd use it for, I'm not sure. LOL Neat that it is offered in .500 S&W, though, because it's way cool to fire the same ammo in your rifle as in your handgun. I do that with my various .357 revolvers and my Rossi 92 .357 lever carbine. The .500 has a, um, bit more whop than .357, LOL.
The single shot are great ,I have the H&R in a 20 ga shotgun and love it ,and for $120 you cant beat it .I think for price of ammo the 45-70 might be a better deal as well . Most of the handi rifles can be had for $220-$240 the other reason I like them too
The NEF in a 45/70 is one heck of a nice rifle.For some reason the 45/70 and 30/30 NEF's seem to have the best accuracy.That's not to say that other calibers in that rifle aren't accurate.
Several of the NEF models are problematic.I have an ultra lite weight .243 that I finally gave up on in the accuracy department.
For the money they are quite a bargain.