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221 FB with a 223 REAMER

IMHO, both the .223 and the .221 Fireball have the same shoulder angle of 23* so it might work. Run the reamer in "short" to get the proper case depth. Might end up calling it a "wildcat" as it may have different case taper specs. Fire form your brass and keep it set aside just for that chamber.;)
And you know someone will jump in and say "it'll never work".:rolleyes: That's kinda like "The sky is falling", etc., you'll shoot your eye out.:oops:
Go for it and report back.:)
 
I was comparing reamer prints last night between the 20 tactical and the 20 vartarg, which is a similar to your question. the dimensions at the base of both reamers are the same., but at different lengths., so you would end up with a smaller base dimension in the chamber. That can lead to the famous bolt lift click issue and a small base die might not be able to resize the brass small enough because of the tighter chamber.
 
I have done this before, it will work, but the back end will be smaller diameter.
If you also have a 223 sizing die, shorten it also to fit.
Results will vary.
 
For the price of renting a 221FB reamer, don't know why you'd go to the trouble. Then in the end, you may end up with unintended sizing problems with your new 'special' brass.
 

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