I have shot a very light .270 wsm with 117 and 140 gr bullets. Same powder, the 140d are more recoil, but slower vs faster isn't what I am thinking about. They are both stout.
12 gauge with goose loads is slow recoil. Muzzle loader is slow recoil. 45-70 is slow recoil. As opposed to rifle in 30-06 shooting 180s, a featherweight .270 with factory 140s, and your example of a 300 wm with 215s are fast, sharp recoil. I have not shot a lot of the 215s, but they are definitely not easier to shoot than 180s at a higher pace.
if you are concerned about recoil, stop, clear your mind and concentrate on what is in front of you. Dry fire practice and live fire practice are the only ways to change, or decide if it is too much. If you can't reign it in, there is no shame in moving to something different. There are so many options available it's worth searching.