Well...I happen to talk to some of their designers and specifically mentioned this to them on a side note and they were very quick to correct me that the pressures were fine and that the reason they added that extra lug was to try and squeeze a little more accuracy out of the .308. I'll find out more on my next visit with them, but until I can see the actual "publication" and from what source...which I will ask them about and have them verify...I am going to remain skeptical. I have seen a few .308 builds that do just fine on hot handloads without a third lug. How many does the M76, PSL, .308 M90s have???