This is the correct insert for 30 cal. I have two of these inserts and they measured .294 and .295. So I think this is correct.
If I'm reading all the pics correctly it looks like the COAL from the factory loaded ammo is .209 off the lands. Quite a jump.
Did you specify ammo that was .015 off the lands. If so, it appears that it not what they made.
Do the rounds fit well in the mag or are they way short of the front of the mag?
It's what they did , to fit mag. And no joke it shots like a lazer ! There is no way I'm getting the berger in that mag . The nosler 200 gran partition is shooting 200 yards and the holes all touch ! So at least if the Bergers don't shoot well I got them to fall back on