For the record, IIRC, those are particularly light rifles for the caliber, so not such a fair comparison. (I keep trying to like stainless, b/c I think that rifle is a steal at ~$650, but so far, no luck!)
You asked about "felt" recoil, rather than free recoil.
This has a lot to do with gun weight, balance, proper mount, cast-off, all those sorts of things that determine *how* that recoil is transmitted and dispersed. Put a laminated stock on there and a Pachmyr deccelerator or some such, and you'll see a big difference.
AEBE, the RUM will kick harder, but a rifle setup for a hard-hitting caliber is nothing like a stamped out hunting rifle design with a 375-cal thrown into it.
If you ever start to feel "small" with that H&H, remember you can always have the chamber improved, get a couple hunert f/s more, and still fire factory ammo in a pinch.
Have fun!