It's a fairly big cartridge in a light weight rifle, so fit, more than recoil absorption per se, will be the key part of recoil pad choice. I built a Handi in 454 Casull which is less stout than your 500 and made sure LOP was plenty long with a good Kickeez Magnum rifle pad. It is extremely comfortable. The 500 will be a great hog gun and factory loads will work well in that role. It's an awful lot of gun for the deer I hunt in the Northeast but the 500 has manageable trajectory out to 150 yards and will hit hard much longer once you master it. You have to think of it like a 45-70 Magnum. You probably won't toss big 500 grs cast bombs with it like some do with the 45-70 but instead use jacketed 300 grs stuff that you are sending out at @ 2200 fps from a rifle barrel. For pigs I'd want to back off the heat and shoot 350 -400 grs lynotype lead at 1400 - 1500 fps. It's not like you need expansion!
This not a precision rifle. It's just short of artillery. You're not going to the range with it to shoot tiny groups. As per above a "shotgun" scope will do you fine and frankly, I'd be very tempted to get just a Simmons or Tasco fixed 4x. It will do what you need and leave you more money to feed that beast.
Enjoy!
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