Re: 7.62x51
Typically 7.62x51, and 5.56x45 military ammunition is loaded to hotter specs than 308 or 223 stuff. Some military chambers are looser or tighter than the civilian spec chambers too. That is the reason for some recommendations to not shoot one in the other. With many here shooting hot match loads in everything though, I would see no harm, but check the chamber fit with the ammunition, and maybe take a ook at the ammunition itself for OAL. I say check OAL because I have had some 7.62x51 military ball that was a little long and had to be pressed a little(I just used a small ball peen hammer to knock them in a little deeper, no issues or anything)<----- he's bullshitting DO NOT DO THIS!