The 200 grain XTPs shoot great out of my 1:30 GM barrel also.
With that bullet in Harvester's H4540BR (crush rib) sabot and a mere 65 grains of GOEX FFFg I get a bit over 1500 fps fifteen feet from the muzzle with 1.5" 100 yard groups. That load was deadly on the three deer I've shot with it - all pass throughs with all the signs of perfect expansion.
I did find accuracy with that bullet falls off if I tried to push them to higher velocities.