I tried to watch this video to improve my grip, but since it's a woman teaching, I just stared at her chest rather than learn anything. Apparently one of Hitler's youth also felt that way. It did make me want to buy more guns though.
Full disclosure, the video is not well edited (in more ways than one) but the info is sound.
Fuller disclosure, the chick in the video is also an SME here, though I haven't seen her in a while.