"Slow burning" and "low flash" are usually on opposite ends of the spectrum, since the flash is created by the unburned powder. Larger calibers, high pressures and shorter barrels all contribute. Your gun pretty much has all those things....
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.