Thread: 308 twist rate

Originally Posted by Friwi

My ballistic software told me for a 300 gr SMk launched at 1040 fps and zero at 100y:

-1723 inches of drop ( or 162 Moa of elevation to click up).
3.3 second of flight time and a remaining speed of 833fps on arrival.

@Friwi can you give more details?
I'm surprised that the velocity loss is only 200 fps over 1000 yards.

My observations with lighter projectiles over 1000 yards is that the velocity drop is 1200 - 1400 fps, not 200 (starting between 2800 and 3000 fps).

Originally Posted by Cyclops

@Friwi can you give more details?
I'm surprised that the velocity loss is only 200 fps over 1000 yards.

My observations with lighter projectiles over 1000 yards is that the velocity drop is 1200 - 1400 fps, not 200 (starting between 2800 and 3000 fps).

Subsonic don't slow down anywhere near as much as supersonic, surprised me when I found out, but all the info and ballistic apps agree.
If a sub slowed by 1200-1400 fps it would be coming back at ya!