Rule of thumb,, slower burning powder in most cases does not do well when loaded undercharged.. In a handgun the pressures can easily climb into rifle pressures and with that handguns tend to come apart..
Personal knowledge along with a Dillon 450 and its manual powder measure loading a compressed load of 2400 ( one round had a short charge ) and a 240 grain cast bullet ( Keith Load ) and I destroyed a Super Blackhawk..
If someone wants to PM me a email address and I will send pics of said pistol and you can post them. I can't with my phone..
How much undercharged do you think it was? Take it was 44 mag being an Elmer Keith load.