Greetings Larrygoat,
I think you are most of the way there. You are zeroing at 200 metres and form a prone rest much the same as you would use in the field. A realistic accuracy in those conditions would be about 1 MoA which you are achieving. Your 17 mm group is from good technique aided by luck. Don't expect that sort of accuracy each time. Every time you lie down to shoot some things will be different, no matter how hard you try, and the point of impact will be slightly different. If you can keep your groups in a 50 mm circle at 200 metres, centered on your aiming point, you are ready to hunt. No need to chase rainbows. The one thing I would Suggest is to adjust your scope for parallax by moving your head from side to side until the cross hairs stop moving across the target rather than using the markings. Other than that you are good to go.
Regards Grandpamac.
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