I've been relying on a highly modified 338 Winchester self-loading Browning Auto Rifle with a custom 30 round magazine but I am uncomfortable with having only 30 rounds available without a reload. I'm thinking that I need a 7.62x51 rifle with a 90 round drum magazine for patrolling my hallway. I realize this is stepping down in caliber so I'm looking for some exploding bullets to make up the difference but I may have settle for something else due to legal issues with the bang-bang bullets. I also worry that my insurance may not pay if I burn my house down with the incendiaries I picked up at the last show. If I can find a load using a 220 grain bullet with tiny projecting knife blades that spin with the bullet and rip the target in half as they pass through at 4,000 FPS do you think this will be sufficient for home defense or should I pick up that 20mm cannon I've had my eye on?