Most shotguns that blow up never show any pressure signs before they blow up. Back in the old days I used some old BPI Hevi-Shot, Steel powder data with the newer Steel powder. I shot well over 100 loads with no problems. When I had those loads tested by Precision they were just over 14,800 psi or about 3,300 psi over MAX pressure.
Below is a link to my old post.
[URL unfurl="true"]https://www.predatormasters.com/forums/threads/warning-on-older-alliant-steel-powder-shotgun-reloading-data.327576/#post-3082025[/URL]
