I think theoretically the chambers were 2 9/16, but they do vary depending on who did the chamber I am guess. I have found that Fiocchis are generally 2 9/16 to 2 5/8, my B&Ps are 2 5/8 and of course Federal are 2 3/4 when fired. I do not believe there is any increase in pressure to be concerned with in shooting the 2 5/8s in a 16 ga Parker chamber. I do shoot some RST 2 1/2s because I like them, but the others fit my purpose just as well. Even my M 21 Win 16 ga has a short chamber and that does not bother me even with the Federals.
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