Re: 6.5G or 308
If your shooting around 500-600 meter either will do.
Im in the process of building a 6.5g Semi. the 65grendel forum has a wealth of information.
The upside to keep it in an AR 556 style rifle is being able to convert back to 300blkout, 6.8, 556 and so on.
AR 308s have...