Gary, as a new member of this forum, I would like to thank you for your work in testing the above 20 gauge loads. As a sub-gauge tube shooter, pressure excursions are important to me. I follow the reloading forums on SGW and Trapshooters.com. Your work is the first that I've seen in which a powder suppliers published load was tested. In the instance above, the results are way off from published data. This is a real eye opener, indeed. From the above 16.8gr data the w209 ave pressure of 12,138 psi and the C209 ave psi at 12,577 would in this case imply about a 450 psi difference in the primer switch and not 2500 psi that has been mentioned (at least in this case).
Last edited by Art Kirkwood; 09-20-2023 at 06:48 PM..
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