The hard primers were for open bolt sub-guns, Sten and Sterling come to mind, but surprised you had a light primer strike with your full auto Thompson.
Once bought 300,000 9mm, from a sales rep, of IVI Quebec. Gen. retired JJ Paradice. Stipulation on sale, had to be fired on Military Ranges, no resale.
Met this retired Gentleman at a trade show in Montreal. We paid 10c a round!
When I paid for the ammunition, by Company cheque, we were paid back by money orders, from the members who bought it, of our Club. It was delivered to a business address, in Toronto.
A month? later, a letter from the Canadian Federal Government..."Please note, no fed tax was paid 10%, you owe (ME, OWED!) a lot!"
I sent a copy of the receipt I got from the General, Retired. Wrote on the back of his personal cheque, all he had to write on, copy of back and front.
"Paid in FULL"
An other month went by, a new receipt arrived in the mail.
The price had been altered to 9c a round, the missing 1c was for the tax!
Big relief.
This lot of Mil Spec ammunition, had failed the drop test? It had really hard primers, the then new to us Glock pistols, had many misfires, Glock in Austria fixed the problem (To a great extent) by altering the angle on the nose of their firing pins, we had ten Glock 17s.
One of our members was a Scientist! He devised a method he called "Tenderizing" You took a hand priming tool, adjusted to exert pressure on the primer! No, no one lost any fingers! This spread the surface of the primer a little, it worked, no misfires after that.
Sitting watching TV was a favorite place to do this! The packaging was in little cardboard boxes, of 64, two Sten magazine loaded amount?
I then repacked my share in 100 round plastic boxes, could not be shipped by Air to matches! Had to be in original factory containers. Winchester etc.
Anyone remember 10c a round 9mm?