Hi all -
In working out my dope on a suppressed V22 with scope height of 2.38", I encountered something odd. All ballistics calculators show that with a 25 yard zero you should expect to be about 2 clicks high at 30 yards. I got 2 clicks low at 30 yards, so that's a 4 click differential. The differential is still 2 clicks at 50, 1 click at 100, and then no difference between calculators and my data out to 230 yards. Also note that I took the suppressor off and all data was the exact same.
My question is, do I believe my DOPE or is it impossible to shoot lower at 30 yards with a 25 yard zero, 1061 FPS, DA of 8000, temp of 88F and scope height of 2.4"?
As I try to answer this question with math, my first thought is to calculate the gravity induced drop from 25 to 30 yards using d = 1/2at^2 and see how that compares to the drop from 2 clicks worth of angle (if 2 clicks is a bigger, then I know it is impossible).
Time of flight from 25 to 30 yards is 20 msec with an average velocity of 1025 FPS
Drop due to gravity is thus = .08"
One mil of angle at 25 yards is .075", so 2 clicks would be .015". Since 2 clicks is so much smaller than the gravity drop, I think that this is possible to explain my DOPE with barrel harmonics.
Does anyone else have any .22 DOPE that shows 30 yards lower than 25 yards?
In working out my dope on a suppressed V22 with scope height of 2.38", I encountered something odd. All ballistics calculators show that with a 25 yard zero you should expect to be about 2 clicks high at 30 yards. I got 2 clicks low at 30 yards, so that's a 4 click differential. The differential is still 2 clicks at 50, 1 click at 100, and then no difference between calculators and my data out to 230 yards. Also note that I took the suppressor off and all data was the exact same.
My question is, do I believe my DOPE or is it impossible to shoot lower at 30 yards with a 25 yard zero, 1061 FPS, DA of 8000, temp of 88F and scope height of 2.4"?
As I try to answer this question with math, my first thought is to calculate the gravity induced drop from 25 to 30 yards using d = 1/2at^2 and see how that compares to the drop from 2 clicks worth of angle (if 2 clicks is a bigger, then I know it is impossible).
Time of flight from 25 to 30 yards is 20 msec with an average velocity of 1025 FPS
Drop due to gravity is thus = .08"
One mil of angle at 25 yards is .075", so 2 clicks would be .015". Since 2 clicks is so much smaller than the gravity drop, I think that this is possible to explain my DOPE with barrel harmonics.
Does anyone else have any .22 DOPE that shows 30 yards lower than 25 yards?
