I let the gun tell me if its max load or not if that's were it shoots then that's were I run it and hornady brass has failed me everytime. I dont like to prep brass and then throw it away after 2 or 3 firings not only is it time consuming then the cost is irrelevant to better more expensive brass that you dont have to spend a to of time prepping.Hornady brass is fine as long as you're not pushing max loads, it's also cheap enough that it averages out just fine cost wise.
I've also talked to three other brass manufacturers over the last year and I have good reason to believe we'll see alternative sources to the .375 Ruger Hornady brass sooner rather than later.