Great video, could of explained a few things more indepth (axial form factor meaning, other come up methods, and what they mean and how to do them, etc). Over all good job!
With the app will only a kestrel link up to provide environmental data or could you use other devices like the vortex range finder with the built in environmental data the 4000 hd i believe thanks.
Regarding the zero distance, is the measurement from the target to the scope turret or some other point? The turret seems the most logical point as that is where the adjustment takes place.
It's usually measured from where you are to target. The maximum variance from shooter to muzzle is 3 ft. Even if it was 25ft, you're not gonna be able to account for that. Maybe at a 1000 yards you might see a quarter inch difference, but I doubt it
It’s target to the center of your Windage knob of your scope. More important is to know exactly how far that is. Many 100yd targets at the range aren’t exactly 100yds, and you could use 3 different laser range finders and get 3 different results. Accurate info in, accurate info out. None of this stuff is necessary if you will never shoot beyond 350-400yds. In that instance, all you need is a good zero at 100-200 yds and use Maximum Point Blank Range determined from a free online ballistic calculator.
Although true about the adjustments being made at the turrets and thus the turrets would seem to make sense but there is a caveat..... Bullet drop is relative to the muzzle, not the turrets. For setting any zero, technically, the distance should be from the muzzle to the target because it is over that distance that the bullet is dropping, not the distance from the turrets to the target because from the turrets to the muzzle, there is no bullet drop occurring. With that said, how much of a difference does this make? Not enough to really matter since the distance from the turrets to the muzzle is almost always going to be less than a yard and until you get to ELR distances for the particular cartridge where the bullet drops in feet per yards type drop rates. Just to give an example of the "less than a yard error", the difference in drop at 1000 vs. say 1001 for my 300prc shooting 230 A-Tips at 2870fps MZ is 0.63"... While I consider myself a reasonably good shooter, I'm certainly not good enough to differentiate a 5/8" error at 1k yards. That is less than the 0.1 MIL adjustment values for my optic so I couldn't dial it correctly even if I wanted to. To put it differently for those who like MOA, that is an error of 0.060 MOA at 1000 yards
@@CJ-ty8sv Thanks for the very well considered response. The lack of drop from the turret to the muzzle is something I hadn’t considered. I knew the difference in drop would be insignificant but I am more interested in the technical difference and why, which you so perfectly explained. Thanks again!
@@Dennisthemenace40 No Problem, you're welcome. Yeah, the actual bullet drop while in free flight is what matters which is why it should technically be from the muzzle to the target rather than the turrets to target. All that the adjustment of the optic is doing is changing the angle relationship between the departure angle of the projectile and the line of sight. As you probably know, but in case not, departure angle combined with Gravity and atmospheric conditions determine how much a given projectile, exiting the muzzle at a given velocity, will drop at a give distance. Adjusting the optic (or using reticle holds... Or combo of both for that matter) is simply adjusting the departure angle to get drop amount to coincide with the particular aim point at distance. Going back to something I said in previous comment about ELR where you can get into drops in Feet per yard, It reminded me of video from the "MarkandSame AfterWork" channel where they had a camera setup from the side view of the target and in one case, because the bullet was well into subsonic flight at the distance he was shooting at (forgot what the particular was but was well past 3k yards if memory serves me correctly), I notices a flicker of light so I played the video back at 1/4 speed. The flicker of light seen was actually the bullet where it was caught by a few frame of the recoding. What was interesting to me was not just that the camera caught a few frames of the bullet in flight but also that the bullet was coming in at about a 50 to 60° angle... Quick Trig shows that at a 55°, the bullet was dropping at 51.4in (4ft, 3.4in) over 1 yard distance. That really put things into prospective for me with how the smallest of change or error at ELR distances can have a huge effect at the target.
Plus a target cam. More beneficial seeing each of the rounds impacting rather the see the shooter loading and pulling the trigger.
I sent out 50 bullets of 30cal 177gr SMKs back in January for your team to add to 4DOF, any idea when those will be tested and added to the library?
Great video, could of explained a few things more indepth (axial form factor meaning, other come up methods, and what they mean and how to do them, etc). Over all good job!
With the app will only a kestrel link up to provide environmental data or could you use other devices like the vortex range finder with the built in environmental data the 4000 hd i believe thanks.
Calypso WM links
Regarding the zero distance, is the measurement from the target to the scope turret or some other point? The turret seems the most logical point as that is where the adjustment takes place.
It's usually measured from where you are to target. The maximum variance from shooter to muzzle is 3 ft. Even if it was 25ft, you're not gonna be able to account for that. Maybe at a 1000 yards you might see a quarter inch difference, but I doubt it
It’s target to the center of your Windage knob of your scope. More important is to know exactly how far that is. Many 100yd targets at the range aren’t exactly 100yds, and you could use 3 different laser range finders and get 3 different results. Accurate info in, accurate info out. None of this stuff is necessary if you will never shoot beyond 350-400yds. In that instance, all you need is a good zero at 100-200 yds and use Maximum Point Blank Range determined from a free online ballistic calculator.
Although true about the adjustments being made at the turrets and thus the turrets would seem to make sense but there is a caveat..... Bullet drop is relative to the muzzle, not the turrets.
For setting any zero, technically, the distance should be from the muzzle to the target because it is over that distance that the bullet is dropping, not the distance from the turrets to the target because from the turrets to the muzzle, there is no bullet drop occurring.
With that said, how much of a difference does this make? Not enough to really matter since the distance from the turrets to the muzzle is almost always going to be less than a yard and until you get to ELR distances for the particular cartridge where the bullet drops in feet per yards type drop rates.
Just to give an example of the "less than a yard error", the difference in drop at 1000 vs. say 1001 for my 300prc shooting 230 A-Tips at 2870fps MZ is 0.63"... While I consider myself a reasonably good shooter, I'm certainly not good enough to differentiate a 5/8" error at 1k yards. That is less than the 0.1 MIL adjustment values for my optic so I couldn't dial it correctly even if I wanted to. To put it differently for those who like MOA, that is an error of 0.060 MOA at 1000 yards
@@CJ-ty8sv
Thanks for the very well considered response. The lack of drop from the turret to the muzzle is something I hadn’t considered. I knew the difference in drop would be insignificant but I am more interested in the technical difference and why, which you so perfectly explained. Thanks again!
@@Dennisthemenace40 No Problem, you're welcome.
Yeah, the actual bullet drop while in free flight is what matters which is why it should technically be from the muzzle to the target rather than the turrets to target.
All that the adjustment of the optic is doing is changing the angle relationship between the departure angle of the projectile and the line of sight. As you probably know, but in case not, departure angle combined with Gravity and atmospheric conditions determine how much a given projectile, exiting the muzzle at a given velocity, will drop at a give distance. Adjusting the optic (or using reticle holds... Or combo of both for that matter) is simply adjusting the departure angle to get drop amount to coincide with the particular aim point at distance.
Going back to something I said in previous comment about ELR where you can get into drops in Feet per yard, It reminded me of video from the "MarkandSame AfterWork" channel where they had a camera setup from the side view of the target and in one case, because the bullet was well into subsonic flight at the distance he was shooting at (forgot what the particular was but was well past 3k yards if memory serves me correctly), I notices a flicker of light so I played the video back at 1/4 speed. The flicker of light seen was actually the bullet where it was caught by a few frame of the recoding.
What was interesting to me was not just that the camera caught a few frames of the bullet in flight but also that the bullet was coming in at about a 50 to 60° angle... Quick Trig shows that at a 55°, the bullet was dropping at 51.4in (4ft, 3.4in) over 1 yard distance. That really put things into prospective for me with how the smallest of change or error at ELR distances can have a huge effect at the target.
Where are parts 1-3 are they called something different?
They are posted right before this one. They all start with Rifle Setup
The manual says 1.0-1.3 sec TOF is ideal
We recommend conducting Axial Form Factor adjustments between 400-800 yds/m or more precisely between time of flight of .5 and 1.3 seconds.
Your mother's a bird!
😂