While not the RST ,I just became a dealer for Gamebore I contacted the company for the pressure range of the 2 1/2 loads in all gauges ,while not specific
the 2 1/2 16 gauge shells will run from 8267-8702 psi,
in fact, none of the 2 1/2 loads in any gauge get over 9000 psi...so when you look over the proof charts that Mr. Day has so graciously posted whenever the pressure suitability question arises ,these should be fine in any Parker in good shooting condition
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