Simple really, i want this gun:

http://securityarms.com/20010315/galleryfiles/2200/2289.htm

and these bullets:

http://en.wikipedia.org/wiki/.950_JDJ

And everyone can pick their jaws up off the floor now

And the chain-gun version: http://en.wikipedia.org/wiki/M61_Vulcan

i think only a super mutant could handle the chaingun version lol, actually i think power armor should be a requirement for the gun i posted.

My god. This would be great for a 10 strength sniper character to have after obtaining the Remnant Power Armor. Without power armor, and/or 10 strength, this thing should make you fall over if you fire it.

Oddly enough, I was looking at this rifle around a week ago as something that would be fun to make... Might get around to it sometime.