[George M. Purtill Member #28]

Originally Posted by Pete Lester

I gotta take the easy shots to keep my average up

Here is an interesting article on the history of the 10 bore that answers your questions in a general fashion.

http://www.wildfowling.co.uk/magazine/tens.htm

Pete
Thanks for that reference.
And here is a photo of two Parker 10A brass shells- 2.625 and 2.875. I never noticed the difference!! But now that I have discovered the 10 gauge my eyes are opened.