Negative-they are NOT the same. 5.56mm is loaded beyond the SAAMI-spec'd .223. 5.56mm chambers have a longer leade than compared to .223's. Most mini's I believe have 5.56mm chambers. Now if the Winchester they advertise is Q3131A, mfg'd by IMI for Winchester, I would prefer to get that. Regular Winchester white box .223 tends to cause trouble for some AR's, but are ok for mini's.
The .223 Win white box stuff is normally found in 55 and 45 gr weights.
Check this for all of your ammo questions http://www.ammo-oracle.com/
The .223 Win white box stuff is normally found in 55 and 45 gr weights.
Check this for all of your ammo questions http://www.ammo-oracle.com/