Recoil, I know how you feel.
My 6x6 fell to my 375JDH 12 miles from the truck and it was a long way packing meat, and I wasn't 58, but I was almost 50.
I never tried the 375 TSX but will. I know the 308 TSX show big velocity gains so guess that big 270 will too. I'm still shooting my 416 Rigby for this year's deer and next year's Elk. I have to check the laws though as it might be too much punishment to impart on a Pa White tail!
Congrats on the Elk. My real goal is to timber-stalk one with my S&W M500.
Too many guns, so little time, so short of seasons, even less money!