In real life most people I know calculate the drop of the bullet when load developing, then the next time they are at the range and they have to adjust their scope and they immediately blame their loads not considering the conditions have changed.
An article from Lilja barrels on BC
https://riflebarrels.com/ballistic-...perature or altitude,to 1000 feet of altitude.
as far as my other statement on how manufacturers exaggerate , here is a article on Research gate that backs me up
https://www.researchgate.net/publication/1888764_The_Truth_About_Ballistic_Coefficients
Then with optical and radar based chronos, you have distance from the muzzle and vibration that will affect the readings. That $600 Labradar has to be aimed precisely at the same spot so it picks up the bullet in it's trajectory every time to get the same reading, the slightest variation in the angle of the unit relative to the rifle will affect where it picks that bullet up. The angle can even be effected by a small gust of wind vibrating the LR 's case. With opticals yoy need to measure the distance from the muzzle and use a light diffuser on the sunscreen for the same reason.
Bottom line is manufacturers BC's and chronos are ok for getting a ballpark estimate, but don't take them too seriously. Once upon a time there was this little bullet ......and it lived happily ever after
An article from Lilja barrels on BC
https://riflebarrels.com/ballistic-...perature or altitude,to 1000 feet of altitude.
as far as my other statement on how manufacturers exaggerate , here is a article on Research gate that backs me up
https://www.researchgate.net/publication/1888764_The_Truth_About_Ballistic_Coefficients
The ballistic coefficient of a bullet describes how it slows in flight due to air resistance. This article presents experimental determinations of ballistic coefficients showing that the majority of bullets tested have their previously published ballistic coefficients exaggerated from 5-25% by the bullet manufacturers. These exaggerated ballistic coefficients lead to inaccurate predictions of long range bullet drop, retained energy and wind drift.
Then with optical and radar based chronos, you have distance from the muzzle and vibration that will affect the readings. That $600 Labradar has to be aimed precisely at the same spot so it picks up the bullet in it's trajectory every time to get the same reading, the slightest variation in the angle of the unit relative to the rifle will affect where it picks that bullet up. The angle can even be effected by a small gust of wind vibrating the LR 's case. With opticals yoy need to measure the distance from the muzzle and use a light diffuser on the sunscreen for the same reason.
Bottom line is manufacturers BC's and chronos are ok for getting a ballpark estimate, but don't take them too seriously. Once upon a time there was this little bullet ......and it lived happily ever after
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