All the bullet makers produce 123 or 125 gr projectiles for them. They are supposedly .310 diameter but I have used the light flat based 308 Sierra pro hunters and got as good accuracy as the privi factory. You need to exchange the expander button for a 308 one though or they are a bit loose.
I don't bother anymore as I was lucky enough to get a whole wodge of barnaul sp and hp a while ago and it's cheaper than reloading.
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