Old cup-and-core bullets of smaller caliber were notorious for fragmenting at close range. When they first came out a few decades ago, my hunting bud referred to the NBT's as 'meat grinders' after similar serial 'failures.' He did swat the largest muley I've ever seen/packed with one of those pills, recovering the base of the cup on the off-side of the buck's neck.

I started pushing Barnes X's when they first came out, and all have performed as expected. In the ubiquitous Remington 700 .243 with a 9.25-twist barrel, the 85 TSX is a good'n and can be had in factory offerings. The same tube will generally stabilize the 6mm 105's in AMax or VLD for a slicker hammer.....