I PACKED powder into a .45ACP load and shot it through my P220 guess what no boom and it still hits the bullseye every time.
Sig 220 is a metal gun not polymer.
I only speak from seeing it multiple times on the range where i work occasionally. Had a nice young fella get a ride to the hospital just a month ago with a part of his finger missing, and bits of Glock in his face from a double charged round. Thank god for safety glasses, or we would have been calling him winkie for the rest of his life. It shattered the lens of his glasses ( oh FYI Browning shooting glasses really do work well )
You may get lucky doing that (packing in the powder)but eventually its gonna bite u in the backside,or destroy your guns internal workings,bbl,slide rails,springs etc.
Just curious how many grains of powder do you consider packed? What kind of powder? Some are hotter than others? (dont take this as confrontational, im just curious )