05-27-2011, 06:14 PM
Stan,
Many thanks!
I was just looking at one of M. Fackler's reports, and it looks like the 7.62 bullet was not the M80, but a 150 gr FMJ, and the sketch showed an outline of the bullet in different attitudes.
I think you see the reason for delayed onset of tumble in the boattail designs is the same for why Tony has been suggesting a hollow windscreen. The boattail moves center of gravity forward, which helps stability. We want to move it backward...
The good news is that there may be some clues in the BT/non-BT results to give us a clue on how far it needs to move and whether the void can be filled with something visible to x-ray but otherwise low density.
Thanks!
Joe
Many thanks!
I was just looking at one of M. Fackler's reports, and it looks like the 7.62 bullet was not the M80, but a 150 gr FMJ, and the sketch showed an outline of the bullet in different attitudes.
I think you see the reason for delayed onset of tumble in the boattail designs is the same for why Tony has been suggesting a hollow windscreen. The boattail moves center of gravity forward, which helps stability. We want to move it backward...
The good news is that there may be some clues in the BT/non-BT results to give us a clue on how far it needs to move and whether the void can be filled with something visible to x-ray but otherwise low density.
Thanks!
Joe