A ban on high capacity magazines will affect exactly one of my pistols: a M&P9c. The rest of my semi-autos are 1911s. I never carry the M&P anyway, so it's really a moot point for me. If I carry a revolver, I usually carry six additional rounds on a speed strip. With my semi-autos, I may carry a spare 7-round mag but rarely. Of couse I could always carry two 1911s.
My home defense gun is a Mossberg 500 loaded with 5 rounds of low-recoil buckshot and 5 more on hand. In the event of a home invasion I am NOT going room-to-room to clear the house. I will hunker down with the scatter gun and call 911.