The free Reloaders Nest website has 122 verified loads for the 338 Lapua and another 30 or so "not yet verified loads".
.338 Lapua Magnum @ www.reloadersnest.com
I am grateful for all those who take the time to submit good loads to the Reloaders Nest website for all of us to benefit from. I have submitted a few solid loads (in other calibers) to that website, that were accuracy node loads, and it was very quick and easy to submit them.
For a 308 semi-auto gas gun, I find that all 308 loads work fine in my DPMS LR308B. One caveat to that point, is that at max chamber pressure loads, you can pop a primer or get pressure signs just a little before a bolt gun. Other than that caution, all regular 308 loads work fine.