On June 24, 1966 the Rolling Stones performed at Manning Bowl in Lynn, MA as the opening performance of their “American Tour” in front of 17,000 curious and excited fans, their first ever appearance in the US. Most likely the location of the very same ball park.
I had to work that night...






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Old Timer alert!
:)

But in this case they were RST 21/2" shells.

Then check the RST rims for roundness with a caliper. Take a batch of shells and insert the rims into the barrel rim recesses backwards and see if the bind. Many AA's are oblate and will. Some are out of round enough that when you just close the gun they are forced into the recesses and, without firing it, it will already open hard, and sometimes hard enough that you can't open it.

That was 2 years before leaving for Viet Nam. I missed that performance but do remember hearing about it

I graduated high school the week before that concert.....





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Lol

Allen, I was there in 68 as well and I'm glad you made it home. Almost 17,000 didn't come home that year. I was I Corp most of the year then III Corp for a few months. Semper Fortis

Harry, we covered (gun fire support/shore bombardment) I corps exclusively except for a number of "danger close " missions off North Viet Nam. I would have rather been able to go to the concert that Dean spoke about.

The cause of these types of problems is explained in an article I have submitted to the Parker Pages editors. Briefly, the cause is the difference in angles of the bore line and the standing breech which allows the head of the shell to be smunched a-kilter from firing pressure. I hope it will appear in the Winter issue.