Yes, JB.IC, I see that the muzzle speed dy/dt function calculation got garbaged up since I had it correct a few days ago. I have been mostly working with the muzzle position y(t) function. I fixed it again.

At bullet release, 1328 microseconds, the muzzle position is slowing almost to an upward moving stop at 1413 mu-sec. The upward speed is 2.3 mm/sec which is not really going to disturb the pitch of the bullet nose down very much during its exit from the barrel. Here is a pdf of the corrected spreadsheet.

Anyone who wishes to use this tool for their own rifle and loads will need the current "live" Excel workbook. QuickLOAD and Excel software are both also required.

At bullet release, 1328 microseconds, the muzzle position is slowing almost to an upward moving stop at 1413 mu-sec. The upward speed is 2.3 mm/sec which is not really going to disturb the pitch of the bullet nose down very much during its exit from the barrel. Here is a pdf of the corrected spreadsheet.

Anyone who wishes to use this tool for their own rifle and loads will need the current "live" Excel workbook. QuickLOAD and Excel software are both also required.