First test. MAXIM

[kz11gr]

https://fb.watch/qjtQn1W3-s/

https://www.facebook.com/video.php?v=1217200199237430

.

 

[pzgr40/42]

So much for "smokeless powder" ...

 

[Eggburt1969]

I presume it's the earlier Mark I or Mark II 215 grain (13.9 g) bullet black powder (BP)-based rounds.

These, as far as I can remember, have a single roughly tubular-shaped charge of compressed BP, which weighs around 71.5 grains (4.6 g).

As such, charge- and hence smoke-wise, it's like firing a fully-auto firearm that's firing black powder 45-70-405 rounds!