That can't be right!
05-03-2023, 07:28 PM
#11
Nontypical Buck
Join Date: Oct 2009
Location: Kansas
Posts: 3,894
Revisiting this one today - I recently had a conversation about the difference between MOA and MRAD with another shooter and it reminded me of this thread - when we look at trajectory compensation in inches, or even IPHY or MOA, the numbers get pretty big pretty fast, and the pattern can be a bit more difficult to remember... And that reminded me a bit of the "that can't be right"
For example - for my 6 Dasher, I can count on my fingers as a guide for my rough trajectory for every 100yrds, close enough to be within 2 clicks, from 300 out to 1200: I just recall that 300 is 1mil, then I start counting 400yrds at my left thumb at 1.5, then add a mil and 100yrds for every finger until I get to my right thumb, which is 900yrds, where I have to add an extra half mil, then 1mil to 1000, 1.5 for 2 fingers, and 2 for my last finger, gets me all the way to 1300yrds.
300 = 1.0
400 = 1.5 left Thumb (add 1 mil per 100yrds)
500 = 2.5 left index
600 = 3.5 left middle
700 = 4.5 left ring
800 = 5.5 left pinky
900 = 7.0 right thumb (added an extra half)
1000 = 8.0 right index (just 1mil here)
1100 = 9.5 right middle (1.5 per 100 now)
1200 = 11.0 right ring
1300 = 13.0 right pinky (2mils)
I won't be wrong by more than 2-3 clicks on any of these distances:
Estimated vs. Actual
400 = 1.5 ~ 1.7
500 = 2.5 ~ 2.6
600 = 3.5 = 3.5
700 = 4.5 = 4.5
800 = 5.5 ~ 5.6
900 = 7.0 ~ 6.8
1000 = 8.0 ~ 8.2
1100 = 9.5 ~ 9.6
1200 = 11.0 ~ 11.3
1300 = 13.0 ~ 13.1
But what's maybe more relevant for this particular thread - 13mils seems like a relatively small and manageable number, and 11 vs. 13 doesn't seem to be terribly extreme It seems a little more surprising when we consider this compensation difference in MOA - as that 2mil gap becomes ~7moa. However, if we think about that difference in linear offset instead of subtensions, that difference is actually 10 1/2 feet of difference between 1200 and 1300 yards, and the total drop compensation at 1300yrds is 51ft 2in... It's a heck of a lot easier to remember 13mils at 1300yrds than 614 inches!
For example - for my 6 Dasher, I can count on my fingers as a guide for my rough trajectory for every 100yrds, close enough to be within 2 clicks, from 300 out to 1200: I just recall that 300 is 1mil, then I start counting 400yrds at my left thumb at 1.5, then add a mil and 100yrds for every finger until I get to my right thumb, which is 900yrds, where I have to add an extra half mil, then 1mil to 1000, 1.5 for 2 fingers, and 2 for my last finger, gets me all the way to 1300yrds.
300 = 1.0
400 = 1.5 left Thumb (add 1 mil per 100yrds)
500 = 2.5 left index
600 = 3.5 left middle
700 = 4.5 left ring
800 = 5.5 left pinky
900 = 7.0 right thumb (added an extra half)
1000 = 8.0 right index (just 1mil here)
1100 = 9.5 right middle (1.5 per 100 now)
1200 = 11.0 right ring
1300 = 13.0 right pinky (2mils)
I won't be wrong by more than 2-3 clicks on any of these distances:
Estimated vs. Actual
400 = 1.5 ~ 1.7
500 = 2.5 ~ 2.6
600 = 3.5 = 3.5
700 = 4.5 = 4.5
800 = 5.5 ~ 5.6
900 = 7.0 ~ 6.8
1000 = 8.0 ~ 8.2
1100 = 9.5 ~ 9.6
1200 = 11.0 ~ 11.3
1300 = 13.0 ~ 13.1
But what's maybe more relevant for this particular thread - 13mils seems like a relatively small and manageable number, and 11 vs. 13 doesn't seem to be terribly extreme It seems a little more surprising when we consider this compensation difference in MOA - as that 2mil gap becomes ~7moa. However, if we think about that difference in linear offset instead of subtensions, that difference is actually 10 1/2 feet of difference between 1200 and 1300 yards, and the total drop compensation at 1300yrds is 51ft 2in... It's a heck of a lot easier to remember 13mils at 1300yrds than 614 inches!
Last edited by Nomercy448; 05-03-2023 at 08:40 PM.
