I am not knowledgeable about 16gauges really, but perusing RSTs site, all the 16 ga shells they sell are 2.5" shells. Not definitive info, but a pretty good indication of what shell length to use.
I know on 12s, some shoot 2.5 because they think it is easier on the gun, and some shoot 2.75 saying that it either doesn't effect the pressure, or that Parker Bros made their guns to shoot 2.75 shells in a 2.5 chamber to get a better seal.
Again, hopefully someone more knowledgeable of 16s will come by soon.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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