u needn't settle for just .22lr, or just

a centerfire. Ciener .22lr kits, for Mini-14 or AR-15, let you have 8-10x the power of the .22, by means of a 20 second caliber swap, to 223. Simply keep the gun in 223 "mode", until you have good reason to risk having it be in .22lr mode, for a minute or so, then swap back to 223. 308 match guns will be disabled for far longer, in attempts to keep their bores clean. So any bs about not having a "fighting rifle' ready at all times is just that, bs.