I haven't bought any ammunition other than subsonic .22lr in a long time, but I haven't been shooting as much as I used to either. I've got more ammo than one could shoot in several lifetimes now. My rule of thumb has always been to have 1,000+/- rounds for each firearm I own and that has worked out well.

Without ammunition a weapon is pretty much useless, a rifle or shotgun becomes a club, and a pistol or revolver becomes a very expensive rock to be thrown...

Edit: but I do need to get me another case of .40...

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Life Member GOA and NRA