The TSX loads were put together with the same equipment and technique as the partition and cup and core loads. My impression is that this particular rifle, for whatever reason, prefers other bullets.
The problem may simply lie with the seating stem cup which may not contact the sides of the bullet and just the bullet tip. If that is the case, the bullet itself will be canted off center when seated.
The bullets you stated as being more accurate have a shorter ogive and are likely straighter. I've seen this problem more than once.
I'd suggest eliminating that variable before giving up on the TTSX or TSX.
