I have a 220 Swift. My load with 55sp runs 3570fps using a Magneto Speed. I have had this rifle for a long time and have only shot it out to 300 yards. My zero is 200 yds,So I Never worred about turning knobs. I now have a 500y. range. I wanted to see what she would do. I shot at 200,300,400, and my last target is at 512 yards. I turned the knob till I put 3 shot in the bull and wrote it down. When I got home and put all my info in the calculator. It was way off. I had to juggle things around to get my drop chart to come out right. Had to bring the velocity down to 3100fps and the bullet coefficent from .235 to .200. to get it close. Could it be my scope Knobs are off. It is an old, Made in Japan Tasco 6x24 mil dot varmint scope. I have got if figured out but the balistic calculator is saying this
300 yd 1.9 moa I hit the bull with 3 moa
400 yd 4.4 moa 6 moa
500 yd 7.6 moa 11 moa
That is a big difference. I guess I should shoot a box target and that will let me know how close it really is.
300 yd 1.9 moa I hit the bull with 3 moa
400 yd 4.4 moa 6 moa
500 yd 7.6 moa 11 moa
That is a big difference. I guess I should shoot a box target and that will let me know how close it really is.