I don't have one, but I really think it's a great cartridge. If you can find 6 GT dies that use a neck bushing, it should work for 22GT. I use a .251 bushing for my 22 Creedmoor, inside my 6mm Creed bushing die. For bullet seating, I use my 6mm Creed Redding seater die with a 22 caliber VLD micrometer seater stem. Prophet River should be able to bring in Redding 6 GT bushing dies etc