Recoil.

A good Limbsaver or equiv.

I was considering the same thing. I have the barrel, bolt head, lots of brass & bullets. I had read in my Lyman manual under the 7mm Rem Mag load data page that the 7mm RM had the punch of the '06 with less recoil.
Everyone I've talked to says the opposite. Having the opportunity to see a guy next to me at the range shooting one and seeing how it moved him back on the bench seat AND seeing how he didn't want to shoot anymore after 5 rounds, I decided to wait. Maybe I'll come across a barrel with a brake.

I still may feel ambitious & brave one of these days & swap it out with my .270. But today is not that day. Good luck with your decision.

Frank in Fla