I did a bit more shooting this morning.

53 gr. of 2000 MR, Barnes 150 TTSX, .050 off lands
averaged 2973 fps at 59,900 psi

Kraky, you are correct on the RL 17, I gave up at 51 grs.
at 2784 fps and 54,000 psi (w/the 150 Nosler BT)

Moving on to the 168 Barnes TTSX .050 off lands:

Big game - To much compression for me (even using a 2'
drop tube) at 51.5 gr.

Varget 44 grs, 2648 fps at 58,800

AA2520 45.5 gr, 2694 at 58,500

2000 MR 49 gr, 2751 fps at 59,600

I also tried Brad's 165 gr Accubond load of 50 gr of
2000 MR (seated .030 off lands)
It gave 2785 fps at 57,600 psi

Again, these loads are for more rifle only. I shot another
165 Superperformance load to confirm pressure and it was consistent at 58,600 psi.