Howdy Ed.
Folks have to understand that after speaking with a factory rep., I used Buffalo Bore's so called "max pressure" loads as my control. This control was set to 11,300psi, 300psi over SAAMI's 11,000max psi.
All of the below data is using psi, not CUP
With this setting, Winchester factory Cowboy Action load pressures THAT I TESTED were so low, they would not even register on the PTII test equipment....below 6,000psi. Meantime, Winchester and Remington's JSP hunting loads came in at 6,700psi and 8,000psi respectively.
Early replicated 40gr of Swiss FFg black powder came in at 14,300psi, while normal modern brass loads came in at a whopping 8,300psi using Goex FFFg.
Early replicated loads using Dupont No.2 came in at 10,190psi, while Sharpshooter powder loads came in at 9,176psi...proving the advertisement that the early smokeless RIFLE loads produced less pressures than black powder.
The infamous 44 HV sharpshooter loads came in at 15,583psi, 500psi over the standard HV published pressure by 1917...and only 1,000psi higher than original replicated black powder loads.
Most of Lyman's handloading Group I and Group II data pressures were on par as well. Thus I have a test line, liner with published and historical data.
The big wonder is......IF my data is reliable, any post WWII Remington or Winchester JSP factory loads of 7,000psi would be safe....ESPECIALLY Winchester's cowboy action loads. And as a reminder, Both Remington and Winchester JSP bullets are .4255" and .426", respectively...while Winchester's lead cowboy loads are .428"
