Loren, you're getting good advice here. If you don't know your chamber length, you can always use light 2 1/2" shells, regardless of your chamber's length. I don't know of any 1929 Parker 20 that had shorter chambers. Having said this, it's not that easy to find such shells in today's challenging market. Every now and then, RST makes a run of 2 1/2" 20 gauge shells. I'd keep checking there.
Good luck and happy hunting.
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"Doubtless the good Lord could have made a better game bird than bobwhite, and better country to hunt him in...but equally doubtless, he never did." -- Guy de la Valdene (from A Handful of Feathers )
"'I promise you,' he said, 'on my word of honor, I won't die on the opening of the bird season.'" -- Robert Ruark (from The Old Man and the Boy)
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