Hi Peter,
Your heirloom Parker was made to shoot modern loads and you'll do fine with anything but magnum or 3" ammo. You don't need to shoot heavy loads either - the chokes will take care of everything as long as you do your part.
We'd love to see pictures of this special gun - please post some up so we all can drool.
What is the barrel length? What are the choke markings on the barrel flats, if any?
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