Excellent video.
I would have to agree. I can't see powder blowing past the bullet unless you have a real loose fit. Maybe it's possible but i think it's powder from the previous shot. I guess the only way to find out is do to this with a clean barrel and check the first shot.Interesting...but is the powder faster, pushing past the projectile, or is it simply residual being pushed ahead of the next round. Seems to me it would more likely be pushing residue ahead...