I am building myself an M82 replica, as are a few people, and have got myself a ZF69.
I'll get a replacement barrel, but they'll want to know what twist I want for it. Ive searched but cannot find out what grain the ZF69 turret clicks are calibrated for. I'm assuming around 150-155 grain, but I am hoping someone knows for sure.
Of course, I am presupposing that the ZF69s aren't all different depending on usage.....