While I haven't had any problem pushing NBT's over 3K, you have and your experience should set the bar IMO. My advice would be try the Nosler Parts 130-150gr, it'll handle 0-300yards & shoulder or rib shots with ease. If it doesn't shoot trythe bonded polymers like the NAB or hornady IB.

I as well used the 130 GK's out of my 270win, no issues just found a BT load that shot better and provided similar effects on deer sized game. I wouldn't be affraid of running some of them in the 270wsm either. IMO if you hit a shoulder at a rate of speed with the GK, etc I'd say they'll come abit unglued as well, the nos. part or similar controlled expansion bullets will not be as fragile and lead to better penetration.

BTW Barnes Triple Shocks expand more reliably then the original X's IME, they retain the same weight so wound channels are smaller then say a Partition but much better then the orginal X. They now havea tipped version which i have not used, but assume it would provide some improvement on expansionto the standard TSX. I have found the TSX to be more accurate and foul less then the original x's as well.

Good Luck