Shouldn't be too awful bad for you if the 125's were comfortable to shoot. The 180's though...they aren't bad but they are stout out of my 6 inch GP 100 with full underlug.
There's enough diffrence in recoil between the 125's and the 158's that you can tell. Not a big difference just a little more muzzle jump. I put a pair of Hogue grips on mine and turned it from a good shooter into a great shooter.
Shot over 100 rds of .357 158gr swc through my 3” SP on fathers day. Thought my hand would be a little sore but it wasn’t. You shouldn’t have a prob with the 158gr’s.
I shoot mostly 158-gr through my SP. I'd say they kick about the same, with a little more muzzle rise than the hot Remington 125-gr SJHP. Not much difference in my opinion.
I can't comment on the feel of the rounds in the Ruger, but I put thousands of rounds through a 3" S&W M65. No problem at all with them. They were all 158gr SWC cast bullet reloads, not max, but very close to it. Extremely accurate, too.