Robert99, I am curious as to why you believe db had 'obvious limited parachuting experience '?
Good question. First, let me say that Cooper apparently had some experience in putting on a parachute. At least Tina said that he didn't seem to have any difficulty in putting a back pack on. And the NB-6 type harness is a bit more complicated than the usual military back pack harness. But then Tina may not have seen anyone put on a parachute before either. So who knows what that means.
Cooper is reported to have brushed off the parachute instructions that had been included with the four parachutes stating that he didn't need them. This doesn't mean that Cooper had any actual jumping experience. All things considered, I agree with the FBI agent who suggests that Cooper probably had some experience as a "kicker" or load master on military aircraft who routinely wore a parachute but had never jumped one. As such, his parachuting instruction would probably have consisted of something like "jump out of the airplane, count to 10, then pull the ripcord." I think the FBI agent who said that "Cooper had just enough knowledge about parachutes to get himself killed" got it right.
Cooper used the wrong lingo in stating what parachutes he wanted. That by itself suggests to me that he was not a skydiver. He got what he asked for but that is not what he thought he was asking for.
Tina stated that the last time she saw Cooper he was tying a chord from the money bag around his waist. That is a big no-no since it almost certainly would have resulted in spinal injuries during the parachute opening. He should have tied the money bag to the parachute harness.
Cooper apparently took the missing chest reserve with him. If he tried to jury rig it to the harness to act as a normal reserve chute, then a bad outcome to the jump is almost guaranteed. Even under the best conditions for a free-fall, Cooper would have been on the ground in 60 seconds and about 40 seconds under the worst conditions. Remember that Cooper would be tumbling and in total darkness during this free-fall.
Based on my aeronautical experiences from my early teens, I know that Mother Nature has the last say in matters such as this and I would NEVER bet against her.
So in my opinion, Cooper was probably a no-pull and on the ground and dead by about 8:15 PM PST on November 24, 1971.