Phil,
Is the difference between "I would be happiest with someone using any of the Noslers" and your present .375 favorite 270 TSX due to the difference between somebody you're guiding, and you backing up?
My guide was a more than an definite yes for the TSX or TBBC and "ho hum" with the Partition. This out of a 375 H&H. Just another 30 year sample I suppose.
I've caught the 300 gr partition in a blacktail before. Shot in the brisket, bullet found in a ham near the a-hole. Shot a single brown bear (backing up a buddy) and it will penetrate on a broadside thru the lungs, but I dunno about heavy raking shots or shoulder bone. 270 TSX is what I'd go with.
