Hi Karl, good question for sure. #1. Many shoot RST because they have short chambered fluid steel guns, such as 2 1/2", and modern shells are 2 3/4".
Recoil is the problem with older wood and PSI does not enter into the recoil equation. Of course PSI is a factor in safely shooting our damascus barrels.
I load a lot of low pressure loads myself, all 2 1/2 ", so I can shoot them in all my guns.
RST keeps fps to a modest level, say 1150 to 1200 fps, and alot, but not all modern shells seem to be high velocity.
RST also keeps the payload minimal--3/4 to 1oz ( 3/4 oz in a 12, 16, or 20 is a sweet shooting load.).
Thus with a smaller payload, lower velocity, the recoil is less--and less problems with the vintage gun stocks--and thats why I shoot them.
Again Google or visit the recoil formula and PSI is never mentioned. The weight of the gun is critical, ie the same load recoils less in an 8 lb gun than it does in a 6 lb gun.
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"How kind it is that most of us will never know when we have fired our last shot"--Nash Buckingham
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