The S&B would be an excellent scope for that purpose, there's none better really. Night hunting for boar in Europe is what they were designed for. The zeiss 3-12x56 and Swarovski 56mm models might equal it, but not better it that's for sure. The meopta 3-12x56 is another great scope for about half to a third the price of the others and gives up very little if anything to the more expensive scopes. If you're going with a non-illuminated reticle model then go for a heavy reticle like the german #4, I think S&B calls their version a #7 or something like that. An illuminated reticle is nice if you want to go that route but is not required, a fat non-illuminated reticle is easy enough to see with decent moonlight. Night vision equipment is a different ballgame and is going to be better than a natural vision scope.
Night hunting with a full or partial moon is very doable with this scope. You don't actually need a full moon, a half moon will suffice. You have to time your hunt so the moon is reasonably high in the sky so the shadows aren't blocking you. The scope must be paired with a set of good binoculars or you're wasting your time, the binos are a necessity at night for acquisition, unaided vision won't cut it. Forget shooting 400 yds though, I'd say 200 would be tops at night and 150 or less is much better. Night hunting is a short range proposition, your eyes work differently at night and too much detail is lost at longer ranges for a 400 yd shot. You can't really look through these scopes in a store and tell which will be better, you need to let your eyes adjust to the darkness for about 30 minutes before you get a real idea of what you can see at night. You night vision doesn't really "come alive" until you've been in the dark for about 30 minutes. Go outside on a moonlit night and sit in a dark area for a while, don't turn on a flashlight or anything. After about 30 minutes you'll notice that everything seems brighter and your vision is much enhanced, it's almost like someone turned up the moonlight and the stars got brighter. That's when the "cones" in your eye that are responsible for daylight vision have shut down and the "rods" that are responsible for night vision have taken over. We never really get to use this unaided night vision because most people never go outside and shut out all the light for the amount of time it takes to get our eyes adjusted to it. Most people only go outside at night with a flashlight or some other artificial light, or they only spend a few minutes in the dark, not enough time to get their night vision up to speed. Put a pair of good binos to your eyes (40mm objective minimum) and you'll be amazed what you can see without any artificial light. You'll have no problem making a good shot on hogs at a reasonable distance with that scope at night as long as you have a decent amount of moonlight and it isn't cloudy.
