It is thicker but not by much - not enough to raise pressures much anyway. RP brass is some of the thinnest for Blackout but neck tension suffers.I do not load 300 BO. Open question for those who are smart - does the Lake City brass have a reduced internal volume due to a thicker case wall? Would this drive pressures up compared to commercial brass in the same load?
Most of my Blackout brass is LC and I have never had any signs of high pressure. This includes the load I use with a 265gr bullet. In that instance the bullet actually bottoms out on the powder below it!