I like the .204 in rifles, it it would be my choice for long barrels. For short barrels I like the .222 Rem., but the .223 is just alittle more. The reasons for my choices, 1. The .204 will shoot flatter and farther in a rifle. 2. In a short barrel the .204 has more muzzle blast and the .22`s will shoot about as far as you can get off an accurate shot. 3. .222 or .223 handgun barrels are plentyful and you can pick up a good used one pretty reasonable at a gunshow., and I`ve never seen a .222 or a .223 barrel that was shot-out.