Of course if you got an bolt gun in 223 made before the Internet came about, the 5.56 would work great.
We never had problems until the Internet told us we couldn't do it.
Or you could ask some one to provide legit proof of a case a problem occurred. Good luck on that one, I've been looking for several years and haven't found any.
Back about 1978 I got a Rem 700 BDL Varmint to use in LE Sniping. To be on the safe side (liability wise) the dept agreed it best to use FMJ M193.
That's all I shot in the gun until I retired from both LE and the NG and didn't have access to M193 and went to reloads.
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Kraig Stuart
CPT USAR Ret
USAMU Sniper School
Distinguished Rifle Badge 1071
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