So I am going to be building a small 3" barrel simple blowback pocket pistol. I know .22lr is cheap, but upon research, I find the .25acp has better ballistics out of the shorter barrels and is the reason for its past popularity with pocket pistols. Anyone have any thoughts on this? I know that neither of these are optimal for defense, and that's not really the reason for the build, it's about the journey not the destination kind of thing. Cost of ammo isn't really an issue. This is in the design phase. I am planning to base the pistol on an existing magazine and will be using a factory barrel. So short barrels .22lr or .25acp