My original theory that Hickey fired 6 accidental auto shots & that JFK was hit by shot-1 is not possible, koz we can see Hickey sitting (high up) on his 2 leather cases in Bronson B09, & we know that B09 is equal timewise to Z319. This timeline gives Hickey time to fire only 1 or 2 shots tween Z313 & Z319, ie whilst standing at Z313 & falling & sitting (high up) at Z319.
Hence the only way to make a 6-shot burst fit the timeline is to have JFK being hit by the last shot, shot-6. Shot-1 had more appeal, but shot-6 will have to do.
It means that Hickey (& the AR15) was falling forwards (& swinging down) during the burst, Hickey being "saved" by O'Donnell in the jump seat.
There are 19 good frames in the Bronson sequence (B20 is too blurry),& we are told that these run at an average of 12 fps.
Zapruder runs at 18.3 fps, hence the 19 frames are equivalent timewise to 28.975 Zapruder frames.
We know from measurements of the scenery passing by that the 19 frames skip at 5 locations, where in effect a total of 6 frames are "missing".
Hence we can consider the 19 to be 25 frames, & these 25 can be considered to be equivalent to 28.975 Zapruder frames.
Hence 1 Zapruder frame is on average equal to 1.16 Bronson frames.
The AR15 fires at 400 rpm which is 6.666 rps. Hence 1 Zapruder frame equals timewise 0.364 shots.
We know that Bronson B09 is at the same time as Z319 approx. And we know that Hickey's shot-6 was at Z313, or at least that his last shot was at Z313.
Hence working backwards we can make the following chart, based on there being 6 shots, which shows where Hickey's shots 6 5 4 3 2 & 1 happened.
If there were only 5 shots then we can change the 6.000 to 5.000 & deduct 1.000 down the column, in which case shot-1 would have been tween Z302 & Z303 instead of tween Z299 & Z300.
So, here is my chart showing the timeline for Hickey's 6-shot accidental auto burst.
B06A.36 & B02A.72 happen to fall on a dummy frame placed at a skip, the A denotes a dummy frame.
There were 6 dummy frames, which i called B02A B06A B08A B12A B15A & B15B. And they have been placed before frames B02 B06 B08 B12 & B15.
shot ... zapruder frame ....... Bronson frame
…….... ………… Z319 ………… ………… B09
………. ………… Z318 ………… ………… B08.84
………. ………… Z317 ………… ………… B07.68
………. ………… Z316 ………… ………… B06.52
………. ………… Z315 ………… ………… B06A.36
……... ………… Z314 ………… ………… B05.20
6.000 ………… Z313 ………… ………… B04.04
5.636 ………… Z312 ………… ………… B02.88
5.272 ………… Z311 ………… ………… B02A.72
4.908 ………… Z310 ………… ………… B01.56
4.544 ………… Z309 ………… ………… B00.40
4.180 ………… Z308 ………… ………… B-00.76
3.816 ………… Z307 ………… ………… B-01.92
3.452 ………… Z306 ………… ………… B-03.08
3.088 ………… Z305 ………… ………… B-04.24
2.724 ………… Z304 ………… ………… B-05.40
2.360 ………… Z303 ………… ………… B-06.56
1.996 ………… Z302 ………… ………… B-07.72
1.632 ………… Z301 ………… ………… B-08.88
1.268 ………… Z300 ………… ………… B-10.04
0.904 ………… Z299 ………… ………… B-11.20