My home was recently broken into (Xmas Eve, I was away, nothing taken due to security system) and it cemented my decision to purchase a firearm (or two). I want a shotgun in the bedroom and a handgun hidden elsewhere in the house. I am not concerned with "little people" getting at the weapons as I am unmarried and not planning to have children for at least five years. After reading many threads (I'm a lurker), I have learned that as far as shotguns are concerned, Mossberg 500/590 or a Remington 870 are usually primary recommendations. My first question is: I'm noticing a limit of only three in the chamber...why? Legal reasons? If so, can that be circumvented with an aftermarket modification? As far as a handgun is concerned, I've read recommendations for Sigs and Glocks. But it all comes down to what fits best in my hand and which weapon allows me to hit my target. Still, I would like to know what effect different caliber rounds have on the firing experience? Do they allow for more stopping power? What about the change in recoil?