That year Rem Parker 16 should have 2 3/4" chambers. Earlier 16's would have had 2 9/16" . But, sometimes people lengthen the chambers and then there are all the issues of whether it makes any difference and whether 2 3/4" shells are in fact that length when fired, all of which are interesting issues to a person who is concerned about those details.
I personally shoot 2 3/4' labeled Rem, Win, Fed and RST shells in my 1921 16 ga and have for 30 years. RST makes fine low recoil and I am told, low chamber pressure cartridges that have reasonable shot loads and speed, so I think you could order either their 2 1/2 or 2 3/4" shells without concern. Or you could call Alex or Morris and ask, both are Parker guys and fine people.
You could get a research letter from the PGCA and its always nice to, but these late Rem Parker guns, there is not much descriptive matter in the records. The records are just from IBM punch cards from that period, unfortunately. It probably wouldn't tell you anything more than you already know. Your 1910 20ga, the records would show a lot more.
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