I am having trouble getting my computer to match my actual trajectory.
Cartridge:
.284 winchester , winchester brass, 162gr AMAX, 50.0gr RL 17, Federal match primers.
The story:
I fired a five shot group at approximately 565 yards with a 220 yard zero. I established the range by milling the target with a mill-dot master. My group center was about 7.5 inches high, with about 2.5 inches vertical dispersion and 3.5 inch total group size. I had 34 clicks dialed on the scope w/ 1/4 minute clicks. Based on the difference between my POI and dope the best match in Knight Bullet Flight had me at around 3150 FPS, which is outlandish with that cartridge and powder charge. However, I set up a clay pigeon gragmetnt (1in. X 3 in. set up vertical) and a small rock (maybe 1.5X1) at around 60 yards. I referenced the dope from bullet flight, and first round hit both, chopping the clay pigeon fragment neatly in half. However, I then setup paper at 120 yards, milled the target, referenced bullet flight again, and now I was about 1.5 inches high of where the computer said I should be with a three shot group around .5 MOA. Sooooo.......
Bullet Flight (with Litz BC) was obviously wrong, since it gave me the wrong dope and a silly velocity, so I went home and put everything into Gseven. This however, gave me the same result as bullet flight. My next thought was that I ranged wrong, because with a shorter range Gseven gave me a corrected velocity of around 2930, which is more what I would expect. So I went back to the range and did a similar set of tests, with two guys ranging the target in both mils and MOA, and got the same results. Went home and plugged the result into Gseven to correct for velocity and got 3144, which I don't believe.
So: can someone help me jive my actual results with some computer, somewhere...'cause I'm trying to shoot my first tactical comp in two weeks.
Thanks,
Dan
Cartridge:
.284 winchester , winchester brass, 162gr AMAX, 50.0gr RL 17, Federal match primers.
The story:
I fired a five shot group at approximately 565 yards with a 220 yard zero. I established the range by milling the target with a mill-dot master. My group center was about 7.5 inches high, with about 2.5 inches vertical dispersion and 3.5 inch total group size. I had 34 clicks dialed on the scope w/ 1/4 minute clicks. Based on the difference between my POI and dope the best match in Knight Bullet Flight had me at around 3150 FPS, which is outlandish with that cartridge and powder charge. However, I set up a clay pigeon gragmetnt (1in. X 3 in. set up vertical) and a small rock (maybe 1.5X1) at around 60 yards. I referenced the dope from bullet flight, and first round hit both, chopping the clay pigeon fragment neatly in half. However, I then setup paper at 120 yards, milled the target, referenced bullet flight again, and now I was about 1.5 inches high of where the computer said I should be with a three shot group around .5 MOA. Sooooo.......
Bullet Flight (with Litz BC) was obviously wrong, since it gave me the wrong dope and a silly velocity, so I went home and put everything into Gseven. This however, gave me the same result as bullet flight. My next thought was that I ranged wrong, because with a shorter range Gseven gave me a corrected velocity of around 2930, which is more what I would expect. So I went back to the range and did a similar set of tests, with two guys ranging the target in both mils and MOA, and got the same results. Went home and plugged the result into Gseven to correct for velocity and got 3144, which I don't believe.
So: can someone help me jive my actual results with some computer, somewhere...'cause I'm trying to shoot my first tactical comp in two weeks.
Thanks,
Dan
