I now fire my .45 cal 7.5 inch naval cannon with 3f ( my revolver powder) at 15-20 grains with .50 wads . You are correct in the sharp recoil and loud pistol crack. I hope with 1f powder(I'll try 1st with small loads) than the recoil will be somewhat less and maybe a deeper sound, not a revolver sound,but maybe a small cannon is just to small for a "boom" vs "crack" type of sould. I have yet to fire a ball,my revolver ball seem a tad large,but I have fired with a 10 bb load packed between two .50 wads. Not that does a nice job on beer (er,coke) cans at 15 ft.
Thanks for your imput! Bill