I’m curious what slam firing is, and why it’s more effective, thanks.
Keep the trigger pulled back and just keep pumping
A slamfire is a discharge of a firearm occurring as a cartridge is being loaded into the chamber. Some firearms are designed to slamfire, but the term also describes a malfunction of self-loading firearms. Shooters accustomed to firearms requiring trigger activation for discharge may be unprepared for a slamfire discharge.
The model 1897 Winchester could be slam fired. It was the common shotgun used by the the U.S. Here is a demonstration:
https://www.youtube.com/watch?v=Sljg40DgQbs