I feel horrible for the girl. Ours shot a Sten at an age younger than this girl...with me hanging onto it "just in case".
Looking at the video, this was a neglident...not an accident.
Looks like Alliant Reloader powder, hard to say what number though without a reference. The higher the number, the bigger the little cylinders of powder.
Use the Reloader 7 for .30-30...fairly small. Seen the Reloader 19 used in .300 Win Mag and it DWARFS the RL7.
The guy that had Shibi watch his house, then was home when Shibi cleared his house with M4s and M79s, THEN said "Ha ha! It's only us...glad I had you watch the house," neighbor?
This QUE Adjustable Muzzle Brake was out lloooonnng before Browning introduced the BOSS.
Imitation is the sincerest form of flattery.
http://www.brownells.com/rifle-parts/muzzle-devices/compensators-amp-muzzle-brakes/adjustable-muzzle-brake-prod1540.aspx?psize=96