I don't think the action is long enough in the xp for the 458. As to recoil , I have a Gary Reeder Custom Encore in .300Wby 14in brl. I thought the recoil would be horrendous, I got sandbags and a jackhammer glove in preparation for the first shot.... IT WAS A PUSSYCAT. Gary's compensator was magic, It feels like a 6" .44, a JOY to shoot. What I'm saying is with the right tech recoil can be managed. Of course My baby spits about 5 feet of flame and the boattail scoots out there at around 2500 fps.