George,
You have a very beautiful Parker. The "D" grades were often referred to as "Doctors" guns. The book indicates it came with 30" barrels. You have received sound advice on determining its shoot ability. I on the other hand have not had any of my Damascus and Twist Parkers barrel wall thickness checked. My thought is this, if the barrels appear not to have been tampered with they pass my test. I have two Parkers from 1881 with Twist Steel barrels. The 10 gauge I reload for. The 12 gauge and all other twist and Damascus 12 gauge shoot reloads or any off the shelf shotgun shells that are 1 oz or less at 1180 fps or less. The following are some of my choices: Federal Top Gun 12ga 2-3/4" 1oz #8 1180fps 25rd box, Winchester Super-Target Shotshells 12 ga 2-3/4" 1 oz 1150 fps #7.5 25/ct, and here is the one I love, Winchester AA Low Recoil/Low Noise Target Loads Shotshells 26 gram at 980 fps. They will break any target on a sporting clay range and cleanly take all small game birds. RST Shells are probably the best shells for our older guns. They are specifically tailored for appropriate pressure and shot payload.
Harry
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