One other consideration is that the closer you push the velocity to the speed of sound, the worse the efficiency will be.... ie shot count will drop.... It has nothing to do with accuracy, but it certainly is of practical importance.... Bob
Yes, for any projectile, there is one specific velocity where the wind drift is the least.... The optimum MV is where the projectile spends the most time close to that velocity, over the range you are interested in.... It's actually not too hard to find that with most Ballistics Calculators .....
I'd love to research a custom drag model for some of the hollow points we're shooting!
QuoteI'd love to research a custom drag model for some of the hollow points we're shooting! All it takes is time, a LabRadar (or two Chrony's that read identically), and an adjustable PCP (oh, and LOTS of ammo).... The range of velocities covered by the drag model will depend on the variety of velocities that you shoot.... As an example, with a LabRadar you can track a 25 cal slug to about 70-75 yards, so if it starts at 900 and drops to 850, then you have to shoot another set (at least 10 shots each) starting at 850, then 800, then 750, then 700, then 650, then 600, then 550, then 500.... Then of course, you need to test them at 950, 1000, 1050, 1100, 1150, 1200, etc.etc. for as far as you want to have your model work.... Then you have to put all the data into a spreadsheet, calculate the Drag Coefficients for each velocity range, and hope you can draw a fair curve through all the Drag Coefficients.... Assuming you can, then you will have a drag model for that slug....Bob