I'm conflicted about the TTSX's performance in your report and my experience with them which has been very good in 7mm, 30/06, and the 375 H&H. No run-offs other than very short distances and most DRT. I have seen some narrow wound channels though and even through soft tissue (lungs).
I wonder if it has something to do with that weight in the 257? Or "that batch" for example?
Maybe there is a simpler answer. The frontal area of a 7mm is about 25% larger than a .25. The 30 cals are half again bigger and the .375s a bit over double. Size isn't everything but it is something. If big guns weren't better for something there wouldn't be any big guns.;)
I've used Barnes in 6mm, .257, .277, 7mm, .308, .338, .375, .416 and .458. I no longer see any sense in using them on anything smaller than buffalo, and honestly if they don't quit making A-Frames I don't want them there either.
