I have tried starline and lapua 6.5 grendel brass. On both brands I am getting the dreaded belt on both. I have pushed the Hornady brass super hard and I never get the brass to deform. I recently watched johnnys reloading bench and he's having the same problem. Don't really want to run a 108 eldm at 2400fps in a lapua case when I reload the factory brass at 2600. I thought lapua could take the abuse but I guess not.