John, the last video has been removed from the link you have. I've seen the video, jerks like that should be castrated.

I've allowed several folks to shoot my 500, from small to large, and have never had anyone disappoined. However, I carry a variety of handloads to the range with me when I take the gun, so I let them shoot the lighter variety, such as a case of trailboss over ~400 grain bullet. I haven't had many want to fire a bunch of rounds!

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US Marine, 16 years+