The Ruger is very strong as far as my experience goes. I would not worry about it at all and, in fact, I would consider Rugers to be stronger and better designed safety wise that some other guns.
The +P thingy is just to bring the old 257 Roberts up to regular pressures. Its not a hot load at all compared to most other rounds. What I think happened is that some old jap rifles got rechambered to the 257R and the pressure was lowered on the round and now its back up to normal.
Those Ultralights have only a 20" barrel and what with the expansion ratio of a 257R in that short barrel there is going to be some muzzle blast. What bullet weight would you really shoot in a 257R? Maybe 120 grs? The 7-08 can shoot 120 gr bullets you know. I would much rather have a 7-08 for game in a 20" tube big game rifle. The main cause of recoil is the powder charge and that accounts for 50% more recoil by weight than the bullet does.
I have an old rifle in the euro carbine bbl. length of 20.5" in 7/57 and the velocity is down just a bit but I like the gun. I would not want one with a 20" tube in 257R or 243 for that matter.
Good luck. "All guns good, shootem good"
