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Uncle Buck · February 17, 2010, 08:26 AM

A little off topic, but still an important observation to the question.

I did not understand the differences between shells. Why would manufacturer AA shells be any different than manufacturer BB shells of the same size. How much internal difference could there really be.

I took some shells and cut them in half and was amazed. Some had thicker walls all along the shell casing, some just near the heads. Even among the same manufacturer there were differences in thickness of the casings. (I do not know what lot numbers the shells were, just the head stamps were from the same companies.)

This would explain the difference in compressed loads. What would be a compressed load in one shell would not necessarily be a compressed load in another.

February 17, 2010, 08:26 AM	#19
Uncle Buck Senior Member Join Date: June 21, 2009 Location: West Central Missouri Posts: 2,592	A little off topic, but still an important observation to the question. I did not understand the differences between shells. Why would manufacturer AA shells be any different than manufacturer BB shells of the same size. How much internal difference could there really be. I took some shells and cut them in half and was amazed. Some had thicker walls all along the shell casing, some just near the heads. Even among the same manufacturer there were differences in thickness of the casings. (I do not know what lot numbers the shells were, just the head stamps were from the same companies.) This would explain the difference in compressed loads. What would be a compressed load in one shell would not necessarily be a compressed load in another. __________________ Inside Every Bright Idea Is The 50% Probability Of A Disaster Waiting To Happen.