walrus108, the 180 gr XTP's are slightly shorter and lighter than the 200 XTP's, having said that, I shoot the 200XTP's over the 9.4 grain loading of 800X to yield 1240 fps, I would say you could start with that loading for the 180 grain Hornady XTP's also.
I also shot the Blue Dot at 10.5 grains for the 200XTP's that yielded 1180-1200 fps from a 5" S&W1006.
The Power Pistol for the 200XTP's I load to 8.0 grains for 1180-1200 fps
I hand weigh my charges only, althought 800X powder dropped well from the RCBS Uniflow hopper.
Good luck with you loading!
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