The 356 GNR was developed by Gary Reeder Custom Guns from Flagstaff, AZ. It is based on the 41 Magnum case necked down to 357. It duplicates the power and speed of the old 357/44 Bains & Davis from the early 70’s, except in a revolver it works perfectly, whereas the 357/44 had major problems with set back and locking up the cylinder.