Help with BC for .30 pellets

Dave · Aug 30, 2015

I was trying to put all the data in chairgun and the only .30 caliber pellet option was the 47 grain with .0420 BC. I looked for updated for database but nothing. Does anyone know what the BC for both 44.75 and 50.15 grain pellets. Or if I need to calculate myself what would be best distances to set Chrono at to provide best accuracy.

Thanks, Dave

hasenpfeffer · Aug 30, 2015

If muzzle velocity is consistent and you're shooting in calm conditions so your vertical POI is consistent, that's all you need. Just plug in the muzzle velocity, elevation, humidity, etc., and play with BC until the trajectory it calculates matches the real one.

ajshoots · Aug 31, 2015

hasenpfefferIf muzzle velocity is consistent and you're shooting in calm conditions so your vertical POI is consistent, that's all you need. Just plug in the muzzle velocity, elevation, humidity, etc., and play with BC until the trajectory it calculates matches the real one.

I have used this method and it is a very accurate way to get a good idea of actual BC. I then calculated BC by using 2 chronies one at muzzle and the other at 50 and also did 75 yards. The numbers from hasenpfeffers method were so close to the 2 chrony method that I no longer mess with setting up 2 chronographs.

Dave · Aug 31, 2015

Thanks guys

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Help with BC for .30 pellets

Dave

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hasenpfeffer

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ajshoots

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Dave

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