This is a tired old wives tale. I've shot antelope to moose with the Barnes TSX and TTSX. It reliably expanded on the ribs of an antelope at 546yds. Same load expanded on a half dozen coyotes from 200-600yds. Vanilla 7mm 140gr TTSX at 2900fps. In 15 years of using Barnes ive never seen them hard to expand.
For the OP, I'd stick with what you've got. It'll work just so reliably it'll bore you.
Well, maybe in your experience, but I have in my possession not 1, but 2 TTSX Barnes that failed to expand. A 168 30-06 and a 250 338 Win Mag. [I still use them, but they are not my first choice.]
I like the Accubonds, and in the short time I have been using them, results have been excellent, both close in and way out there.
The Swift Scirocco is also an excellent bullet, but does not shoot well in all rifles.
Of course, my bullet for comparison is the venerable Partition. In 50 years of hunting with them, I have found them to be reliable and deadly.
There are a number of other good bullets out there, but availability and functionality in a given rifle are often negative factors.
Some seem to put a lot of importance on cost, but I think that is a bit of a Red Herring. Bullet cost is but a small part of the cost of hunting today.
Regards, Dave.