Airgun Technologies Vulcan 3hp .30 reg

Just curiouse on what the max pressure the stock reg for a hp vulcan 3 is stable at. Im wanting to push a 66.6 gr slug close to 1010 fps. I havent dug into gun yet to adjust regulator. I do have a reg tester and was hoping to not over pressure the reg playing around. I dont know what my reg is at from talon tunes but it will push a 65 gr hp at about 960ish. My slugs are made with corbin setup with
.3058 dies. The reason for 66.6 gr is its about the max my magazine will allow. And id like to push the devils pills. These are hollow point cup base and x ppunch cup base