I am wanting to build a rifle in 221 fireball. I have always been intrigued by this caliber. My biggest question is what is the best path for magazine? Internal box or detachable mag? Will the shorter 221 case feed out of 223 magazines reliably? The rifle will be used for recreational target shooting to about 500 yds. I thought about buying an older Rem 700 and then rebarreling and new stock. Or start from scratch with a Mack Bros action. Any advice appreciated
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