Ian: OK-that helps alot. My box of Eley Grand Prix 15/16 oz 16g loads states "...for a service pressure of at least 3 tons per sq. in. or a European proof pressure of 850 kg per sq. cm."
SO IS THIS ABOUT RIGHT??
A service pressure of 3 tons per sq. in. =European proof pressure of 850 kg per sq. cm. (BAR)= 12,328 psi proof pressure= 8960 psi service pressure= 650 BAR service pressure

Last edited by revdocdrew; 03/30/07 09:43 PM.