Are you sure the 65 stamping indicates original chamber length? Was the gun ever proofed and stamped as such? Pictures of any all stampings might help people here give you some advice.
2 7/8" chambers are just that, designed to shoot hulls that are 2 7/8" long (after firing) whether they are roll crimp, fold crimp or brass.
I am 100% confident RST will tell you the fired length of their hulls is what they are advertised to be, 2 5/8" or 2 7/8".
Were the chambers of your gun lengthened at some point, maybe. As Frank said all you can do now is have the barrel walls measured to determine how thick they are in the thinnest part of the chamber and go from there.
You will gain nothing by dismantling your 2 7/8" reloads and shortening them, 2 1/2" shells fired in longer chambers (yours are now 2 7/8") won't reduce chamber pressure.
Go have your barrels measured if this is causing you great concern because nobody here can tell you much more that is going to help.
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Progress is the mortal enemy of the Outdoorsman.
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