TKS .264 - they appear quite consistant at that velocity.

I'd think the ADI H4350, H4895 or Varget, H414 or W760 might deliver a more appropriate 3,200fps to 3,250fps(or more) for those light bullets - just a guess as that is what the older XLC's did and they are supposed to give similar results to the TSX's?
That should stretch out the trajectory a bit - but probably not necessary at all.

If they are accurate and kill well, that's what's important.