it seems reasonable, since AR and pistol and revolver reloads can be done in a second, for a double rifle to be done in 2-3 seconds. i am picturing you throwing two 50bmg sized shells in the chamber like jerry miculek throwing moon clips into revolver. do you hold the gun with the support hand and load with the strong hand or vice versa?All of the double gun shooting is from off hand with no rest. But I’m thinking I might be over stating a bit on the speed.