There is something wrong with that chart... .22 > .38spl and 9mm and .22 = .357mag???
I'm pretty sure that's not accurate.
The Second Amendment is a doomsday provision, one designed for those exceptionally rare circumstances where all other rights have failed - where the government refuses to stand for reelection and silences those who protest; where courts have lost the courage to oppose, or can find no one to enforce their decrees. However improbable these contingencies may seem today, facing them unprepared is a mistake a free people get to make only once.
-Hon. Alex Kozinski (Silvera v Lockyer, 2003)