Thank you Drew for all that work to explain the conversion. I greatly appreciate your efforts.
Just some thoughts: 1) that factor of 1.5 in the tons to psi conversion formula seems a little nebulous; and 2) all the period American literature I've seen uses the word "tons" as compared with "long tons"; and 3) I wonder why Burrard apparently didn't use the typical English "tonnes" to indicate the long/metric ton.
Some final comments, on the Kent TM velocity. I've tried but haven't been able to confirm where that figure is indicated. Whether that's at 3 feet, or is "extrapolated to muzzle velocity" as has been done on at least some UK shotshells in the past. That 3 feet makes a huge difference in speed (when measured so close to the muzzle) and of course a higher number sounds better in the adverts. Nonetheless I believe any Kent shotshell sold in the US adheres to SAAMI pressure standards, same as competing shells by US manufacturers. Maybe Kent has some secret magic gunpowder that produces much higher speeds than the US shell makers can do, but still at accepted max pressure?
