This is a discussion on Calculate BC from Point of Impact within the Fieldcraft forums, part of the Field & Tactical category; I have an app for pellets (chair gun) that allows me to calculate the BC of pellet guns using point of impact, but it errors ...
I have an app for pellets (chair gun) that allows me to calculate the BC of pellet guns using point of impact, but it errors out at higher velocities and with POI over 100 yds because it isn't designed for rifles.
Anyone know of a program for rifles?
Thank you for your time.
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There are some great apps i use chair gun for air rifles then for my powder burners i use strelock pro, appplied ballistics, ballistic arc, and lapua when im looking for a first round hit i used my log book and applied ballistics with ballistic arc and check the numbers against each other if everthing matches i fire it takes alot of data collection to make the apps work to there true potential but i recommend ap or ba if you are willing to pay for free strelock paid strelock is good too
I like Knight's armament's bullet flight (M) app. It has a bc truing feature.
The problem with this method is that one is playing with a fixed "variable" as if it is changeable. Ballistics calculators work...and work well if they are fed all of the right information. Now...when they don't work it is usually because someone guessed at the temperature, humidity, muzzle velocity, BC, etc. Now...with most of these numbers all one can hope to do is to get close. I might know the temperature within 2-3 degrees and the humidity within 3-5%. I might know my velocity...but it might vary from 5-10 fps or more. Ballistics Coefficient should be a "written in stone" known variable. Ballistics Coefficient changes typically with bullet speed...but not much else.
Now...If you don't know the BC of the bullets you are using it is POSSIBLE to figure backwards with a ballistics app...but it is only accurate if every single other variable is also accurate. Teh only way to know if every single other variable is also accurate is to check poi against the ballistics app at several different distances. If you are willing to take the time to check poi at several different distances...you can record your results and then you don't have a lot of need for the ballistics app.
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