Congrats on the Remington ammo. Good stuff; moderate but better than most.
Yes, run the stock 17 pound Recoil Spring. It will do just fine even with hotter UNDERWOOD Ammo.
KKM will do great; no use spending money on Barstow.
I don' t recommend LoneWolf anymore. I personally feel their Quality Control is in the Dumper; their barrels were much better a couple of years ago. So perhaps a used Lonewolf if you could personally drop a shell into the chamber and see for yourself the case support. Just my opinion. KKM won't have these issues.
Think about reloading in the future. It makes life grand when you have components and a good reloading press to make just about any load you desire. And if you shoot alot, you will save some bucks.
Good luck, be safe and have fun!