I was considering using the 9,3 in a Valmet 412 and can easily regulate for the 320gr. I don't particularly like O/U's for dangerous game, however...too slow to load that bottom barrel while running!!! I did take a real classic looking old buff of 39", deep curls and all battered and banged up with a Simson 12x12x9,3x74r drilling with 286 Woodleigh solids. I was shooting Francolin, and there he was. My PH said OK and the game scout thought that the 9,3 was a 375 flanged...so, what the heck. It was a good shot across the left leg and through the heart. I started breathing again when he turned and limped off to die about 150 yards away. I felt a tad foolish standing there with two barrels of 1 1/4 ounce of 5 shot as follow ups! I posed for photos with my 416 (no evidence...) Think I'll stick with a 416...