Thanks, guys.
Yeah, I probably should have patented the design. Be easy to make on CNC machines now. I also thought of the hybrid ogive (tangent transitioning to secant ogive) about three years before Berger came out with theirs and might have been able to patent that, too. However, designing something and coming out with a production model takes time, so both Redding and Berger may already have had the ideas in development when they occurred to me and already had their patent disclosures filed. So it may not have worked out in either case. For a technology that is generally developing, it is not uncommon for different inventors to come up with the same solution nearly simultaneously. It's sort of like the evolution of an invention is driven by technological circumstances, and if one person doesn't get to the patent office with it or something close enough to it, another will. The most famous example is Elisha Gray, who, like Alexander Graham Bell, invented the telephone but got to the patent office to file his patent application just two hours after Bell did, and that cost him the patent (not to mention fame and fortune). Usually, things aren't quite that close, but months apart isn't all that unusual. I'm currently a witness in a patent dispute over one of my old patents that has come down to months of gap between who had what documentation and when.
To see the speed of primer ignition and the primer cup backing out vs. powder and pressure, take a look at
this video. The most informative view starts at about 8:30. The guys doing the experiment use one of those tiny little pinfire novelty guns to fire a ball into the primer on an exposed round of 9mm. You can see the primer impacted by the pinfire ball, and it takes about 10 microseconds for it to penetrate into the primer cup completely. I don't know when in that 10 microseconds, the priming mix actually started to burn, so I have a 10-microsecond range in all timing. It appears the primer has backed out and cleared the primer pocket at 60-70 microseconds after the impact, and you can see flame and gas from the powder burning just in front of the flash hole chasing it out. The initial bullet movement is a little hard to resolve because the case moves a little and stretches a little before it lets go, but it appears to me the bullet actually starts slipping out of the case mouth at about 90-100 microseconds after the primer is struck. This agrees with data from Brownell et. al. The bullet clears the case mouth at about 490-500 microseconds. You catch a brief flash from the powder flame at its base that extinguishes as the pressure drops, lowering the burn rate, and the powder grains start to get too far apart to carry the ignition process forward.