chrisward3
Regular
- Location
- Ottawa, ON
.223 and 5.56 have very similar dimensions (not exactly the same, but close enough that they will fit and fire in either gun).
The only reason that 5.56 is not safe to shoot in a .223 barrel is because the small differences between the two cases cause too much pressure and may damage the gun. 5.56 factory is meant to have increased pressure for military applications.
that said, ive reloaded and seen 7.62mm and 5.56mm cases used in .308 and .223 dies with no issues, as long as you dont exceed the maximum loads from the charts when adding your powder.
The lower has nothing to do with the calibre of the gun, its just a "look cool factor" thing...u can see 9mm and .22lr uppers mounted on "223" or "556" lowers...it doesnt realllly mean anything...
The only reason that 5.56 is not safe to shoot in a .223 barrel is because the small differences between the two cases cause too much pressure and may damage the gun. 5.56 factory is meant to have increased pressure for military applications.
that said, ive reloaded and seen 7.62mm and 5.56mm cases used in .308 and .223 dies with no issues, as long as you dont exceed the maximum loads from the charts when adding your powder.
The lower has nothing to do with the calibre of the gun, its just a "look cool factor" thing...u can see 9mm and .22lr uppers mounted on "223" or "556" lowers...it doesnt realllly mean anything...




















































