I refer readers to the use here of the video seen at~
https://www.bing.com/videos/search?q...51&FORM=WRVORC
~ which gives an excellent feeling of standing behind this weapon and the effect of the smoke pushed out from the 577 black powder cartridge ...This actually often obscured the targets .. As the presenter says this weapon went all over the planet and in the hands of a trained shot was devastating...and could be fired at up to 23 rounds a minute...incredible for a single shot, hand fed weapon.