It’s very easy to overload cartridges for semiauto pistols, the only thing containing the pressure is the back end of the barrel. Don’t try to save money on motor oil, condoms, or ammo for semiauto pistols.....
I have a neighbor who did the same thing with a Kimber.
He is the son of my father’s closest friend. And he is a mechanical engineer.
He reloaded some ammo and measured powder with a new scale. Only problem was, he loaded more than 2X the amount of powder the maximum load specified.
It was a wonder he was not killed. The pistol was a total loss. He had a slight wound to the ear.
I used a lot of win296 in 44mag, 240 gr hard cast Keith SWC. A low density charge creates a bomb, and it doesn't take much of an error. A load I recall was 24.5 grains and down around 20 grains you were entering dangerous territory. Too much powder in that scenario would just blow on out behind the projectile.
Detonation is the result of a small amount of powder lighting off and sticking a bullet in the barrel. The main charge then goes off and produces huge pressures because it cannot move the bullet quickly enough. This is per Hodgdon which reproduced the effect in their
lab which is the best operation in the US.
I use black powder for all my short loads because it is predictable but the techniques are different than are used for smokeless those techniques cannot be used for smokeless.
I would suggest researching techniques used at www.castboolits.gunloads.com before doing anything with short loads. And ask about specific loads in your model of gun. There are lots of chemists and engineers on the board and you should read their answers very carefully as many are quite expert.
Short loads are done with fast pistol powders because they are flakes and all of the powder goes into the air when the primer goes off and the powder explodes at the same time. Use of filler such as upholstery batting is highly reccomend as it interrupts any large shock wave that may develop.
There is much bad information about this subject on the internet, especially youtube, and I would disregard it except for castboolits.
W296 is specifically placarded against short loads and I would not use it for that purpose.
I am not an expert compared to many with whom I correspond but this is simply the short version that doesn’t venture into the real technical issues which must be accounted for.