Reply To: Does a flatter trajectory translate to a more accurate round?

Forums General Discussion Does a flatter trajectory translate to a more accurate round? Reply To: Does a flatter trajectory translate to a more accurate round?

Link

I_Like_Irons
Participant
Member

“AZBOBCAT”If you had zero wind I would say it doesn’t matter  what the fps is. Now if we are talking real world with wind the slower round would have more time to target to be acted upon by the wind,.


Not quite how that works.  The wind effect minimizes at about 800 to 850 ft/s.  When your pellet or bullet goes faster than that there is more drift due to wind, until it is pushed at a bit above 2000 ft/s.  The wind drift maximizes at about 1500 to 1700 ft/s and is more dependent on shape than at lower velocities. 

At extreme ranges (greater than 100 yds for a pellet), then you want a subsonic pellet or bullet to have the average speed between that 800 to 850 ft/s for the minimum wind drift. 

The reason for this effect is that the drag on the projectile goes way up as the speed approaches the speed of sound.  Below Mach 0.8, air can be treated as a non-compressible fluid.  Between that and about Mach 1.2, air is semi-compressible, while above Mach 1.2, it becomes a compressible fluid.