Phil,
I have measured the following shells:
UMC 10B Berdan Primed- Head 0..816"; Mouth 0.811" 2.98" long
UMC 11B Small Primer - Head 0.824"; 3.06" long
Although the head diameter of 0.824" is a god match for the chambers of my 11-ga#3561, they are both too long to fit in the 2.5" chambers.
I have never seen a 10B or a 10A brass or an 11Paper or 11Abrass shell with a Parker headstamp. Has anyone????
These beasts must be rarer than Unicorns. ---if they ever existed.
Yours,
Richard
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"Double guns are a sport and a pastime built into a beautiful package to which I attach myself when entering the great theater of autumn, those days now grow more precious because we are given so few".. Robin Lacy
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