I bought a barrel off a different forum and it should be here in a couple days. It is a 6.5-300 WSM barrel. So here is the question. What do I use for a go/no-go gauge for this install? Do I use a 300 WSM Gauge? A 270 WSM gauge? Or do they make a specific 6.5-300 WSM gauge?

Second question? Which is better 300 WSM brass necked down? Or 270 WSM brass necked down? I am almost leaning towards 270 brass simply because I wouldn't have to neck it as much.


Any thoughts or experiences?