That is pretty tuff stuff. Are you measuring case heads? I haven't seen any data for the super close to that. That being said in a comped barrel using super brass the super should take any load a Rowland will. The brass is as thick as a .308 in the case head area. I have pushed 265grs up to 1200fps with no issues but I have found backing down to around 1125fps still performs well, gives the gun less of a beating and is a tack driver. reflex264

"A quiet hit in the right place is better than a loud miss in the wrong place followed by 10 more shots on the run"

I was a handgun hunter, when handgun wasn't cool.....