I don't have a .480 Ruger, but I do have a 12" barrel in the .454 Casull. Recoil is definitely manageable with it and I've heard that the .480 Ruger has a gentler recoil. Accuracy is very good with my barrel, some loads keeping it under an inch at 100 yds, I've posted some 50 yd groups below, I can't believe the .480 would do any worse with some good load development, good luck!
Selmer