Dave gave you good advice. I would add that I have a somewhat different opinion on shooting 2 3/4 inch shells in short chambers. I believe that the pressure increase of shooting 2 3/4 inch shells in the shorter chambers of the old 16 bores is minimal.
I personally would and have shot 2 3/4 inch shells in the older shorter 16 bore chambers. It's up to you to decide what to shoot in your gun. RST makes great low pressure short 16 bore shells perfect for old Parkers.
If you do decide to shoot the gun with standard factory shells, stick to the low brass loads rather than the maximum loads. It's not a safety issue, but the lower pressure loads are easier on old guns. High brass maximum loads are never necessary, in my opinion.
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