what can be shot in what 5.56

[mutt]

Can someone give me a simple rundown in the chamber difference and ammo choice for a upper marked 5.56

Can I fire .223? It is it a different pressure.
Can I run ammo like wolf steel case? It is all Chrome lined chamber and barrel.

Thanks.

Differences between .223 and 5.56: http://ammo.ar15.com/ammo/project/hist_diff.html. Shooting 5.56 in a .223 chamber is generally not recommended.

It's my opinion that if your rifle can't shoot steel, your rifle has issues. Just my opinion. Steel case won't damage your rifle if all the components are good quality. I've noticed most people who have extraction problems have tighter .223 chambers. Here's a good video about Wolf ammo 'problems': http://www.youtube.com/user/Sturmgew...42/VR3fi1wCSmM

But there is no question Wolf is dirtier and less accurate.