The Firing Line Forums - View Single Post - Bullet Trajectory different than computer model

**Unclenick** · September 7, 2005, 10:42 PM

Ethernectar,

I ran this load on QuickLOAD. The link you gave listed the overall length at an impossible 3.925 (the bullet shank wouldn't even be inside the neck). I was guessing they meant 3.3925, but tell me your OAL? At 3.392 you are over 7% compressed and up against the pressure maximum. Predicted velocity is 3070.

Also, what altitude is your range above sea level? Are you shooting up or down slope, and if so, at what angle?

Nick

P.S. QuickLOAD is usually within 2% of predicted velocities, but it can get to more like 1% if I have specific bore information: number of lands, width of a land and height of a land, slugged groove diameter.

September 7, 2005, 10:42 PM	#35
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,061	Ethernectar, I ran this load on QuickLOAD. The link you gave listed the overall length at an impossible 3.925 (the bullet shank wouldn't even be inside the neck). I was guessing they meant 3.3925, but tell me your OAL? At 3.392 you are over 7% compressed and up against the pressure maximum. Predicted velocity is 3070. Also, what altitude is your range above sea level? Are you shooting up or down slope, and if so, at what angle? Nick P.S. QuickLOAD is usually within 2% of predicted velocities, but it can get to more like 1% if I have specific bore information: number of lands, width of a land and height of a land, slugged groove diameter. Last edited by Unclenick; September 8, 2005 at 09:15 AM. Reason: Added query