I've got (3) chronographs,but haven't used any of them in multiple years. Shooting last pass daily with The 'Horn and his new Garmin,I decided to order same,due size weight,ease of use and the fact it misses NOTHING. Hint.
DOPE is very easily factored via sound erector,but ES/SD isn't as easy to capture. Hint.
If one KNOWS starting speed,atmospherics and BC,it's a breeze to extrapolate impact velocities,as far as you please. No second chronograph needed,or wanted. Hint.................