Make mine a .577 either 3" or better yet a 3-1/4" (lower pressures-especially if built on a shotgun frame). Regulate it for the 650 at 1850 and go on down the road. Im sure Demas would do this provided factory ammo was availabe from Kynamco. I got in touch with David at Kynamco and asked the very question about getting ammo for Demas to use for regulation 90/650 loads and he said yes. There would be a min order amount but the option is there. I do not shoot factory ammo as its way over priced but gun makers want factory fodder to regulate. Demas is currently making seveal 100/750 guns that should be here in the US soon. They weight in at an even 14 pounds. Change the load to 90/650 and keep the weight at 14 pounds and it would be a dream to shoot. With 600-610gr cast bullets it would be big fun to shoot and very inexpensive to blast with. One never knows when a herd of charging milk jugs might need to be culled:)))) bang..bang..............bang..bang

Corbin