Why? Because Parker said we could.
Parker Brothers
1893 Catalogue
“Our guns are bored on the latest improved system for shooting Nitros, or Smokeless Powder, and all our guns are tested with some one of the most approved makes, and a tag accompanies each gun, giving the results of such a (pattern) test.”
1902 Sears catalog
"ALL ARE BORED FOR NITRO OR BLACK POWDER"
"RST is still 3X the chamber pressure as a BP load." is incorrect
Please see
https://docs.google.com/document/d/1...aAfUOZEFU/edit
Factory reported RST 12g pressures in 2016. Of course components could be different now
Ultra Lite 2 1/2” 3/4 oz. 4400 psi
Falcon Lite 2 1/2” 7/8 oz. 5400 psi
Maxi Lite 2 1/2” 1 oz. 5700 psi
Lite 2 1/2” 1 1/16 oz. Roll Crimp Paper 5900 psi
Lite 2 1/2" 1 1/16 oz. Plastic 6100 psi
Premium Grade Pheasant 2 3/4” 1 1/4 oz. 7800 psi
Please see
https://docs.google.com/document/d/1...hIiY62Hx4/edit