Case capacity difference lapua vs Hornady

[9mmrevolver]

Anybody know what % to go down by using Hornady brass in 338 lapua?
Normally I use lapua brass but got some Hornady as a gift. Lapua brass holds more than Hornady. I have maybe a half grain flowing over the top of the case mouth.

[JagerDog]

10% below max...like everything else.

That's the book answer.