Congratulations on a some spectacular shooting.... I am a bit confused by the 217 FPE remaining at 1100 yds., however, that would be 796 fps, which would require a BC (G1) of about 0.75, not 0.271.... Using a muzzle velocity of 986 fps and a BC (G1) of 0.271, works out to 570 fps at 1100 yds (111 FPE).... This makes the shot even more remarkable, of course.... I used the JBM Ballistics Calculator and assumed the BC quoted was for your local conditions....

Bob