Perhaps if the question was better the responses could be more helpful. The kind of meh answers you're getting is a sign that the question is poorly constructed. First of all, that's a HUGEASS velocity window. 2600fps is pretty spanky for an impact velocity. Pretty much any expanding bullet will expand at that kind of impact speed. Problem is, it's a bit much for some bullets. As an example for me, SST's routinely shed the jacket hitting elk size game at that kind of speed and even a good bit under 2600fps. 2000fps might not be enough for some really tough bullets to expand more than a token amount but it's enough to open up or fragment most anything designed to open up or fragment that's not in the ridiculously tough category like some (but certainly not all) monolithic copper hunting bullets. Use core-lokt, it worked for quite a number of decades. If you don't like those, I particularly like Nosler Partition and Swift A-Frame.