PersonallyJune 18 2017 at 5:31 AM
|Miles (Login Miles_M)|
Response to .22 Pildrivers (part 2 of at least 3)
I would not use that BC calclator for a Piledriver shaped projectile. You need to base the BC on a suitable drag law for the Piledriver shape which will not be the same as a drag law shape for a normal pellet and certainly will not be a constant value. That is why a number of different values of BC will be obtained for the different speeds.
The calculator does not take into account any changes in air pressure, temperature etc. or wind speed and direction during the tests all of which can and will affect the values of the calculated BC if you ignore them. It would be better to use Chairgun which gives a choice of reference drag laws and the ability to input the atmospheric conditions.