Thread: New Defence Force rifles need firing pins replaced

Originally Posted by Proudkiwi

I’m not sure your understanding of BC is as strong as you think it is.

Drag is drag so it’s entirely accurate to state that a flat base spitzer will lose velocity and energy faster than a boat tail.

@Proudkiwi

I agree.

What I'm specifically I'm talking about in terms of BC is that BC is not fixed for a given bullet, but BC varies according to the velocity the bullet is traveling at. Causes of drag are made up in different proportions at different velocities as the bullet goes slower and slower, front drag predominant at the fast outset, tail drag dominant at the slower ending.

Both spire tip and boat tail do act in overcoming drag all the way. The spire tip is the star at the speedy beginning of the bullet's travel, and the boat tail gets its own Oscar at the final part of the journey. But for short journeys, as envisaged for say the 7.62x39, the added complication of a boat tail may not be considered worthwhile in an agricultural implement like the AK. If you have a fine rifle that is sterling at handling Berger VLDs, you however have no reason not to use boat tails for work at any range.