Lee,
Crittergetter had a 30-338 Lapua, 116gr capacity he said. I'm guessing it's identical to the 300 Lapua, which is just a necked down 338 Lapua, but he may have improved it and just not said?
I've seen it in the manual as well, that's the only place I've seen it though. Dave Kiff at PTG told me the 300 Lapua brass is NOT as strong as the 338 stuff, not just necked down 338L it appears, so only buy the 338 Lapua brass and form it on the 30-338 Lapua Imp I was doing. Nobody sells 300 Lapua brass anyway, so the 338 Lapua brass was what I got. I wonder if it's popular over seas?