Since the 221 Fireball is a shorter cartridge than the 223 Remington why would you need too remove the magazine block. Why would you need too remove it in 223 other than if your shooting bullets in the high 70's and into 80's in weight. Unless the barrel twist rate was increased to 1 in 7'' don't know if they would be stabilized with Savages 1 in 9" twist. You would need to remove the extended bolt head baffle and replace it with a regular bolt head baffle. Otherwise you couldn't make use of the additional magazine length if the magazine block is removed.
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