Shooting XM193 in a 223 Rem.
I recently acquired a Howa 1500 chambered in 223, and I'm curious to know if it is advisable to shoot XM193 FMJ rounds through this gun. I already have the ammo for my V93, but that gun has a fluted chamber and renders the cases unsuitable for reloading, so if I want to use the cases they'd have to fired in the new gun. I have heard stories about military ammo causing permanent damage to sporting barrels (compromising future accuracy), and I don't want to run into overpressure situations if the chambers are subtly incompatible.
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