Looking at a couple different Super 91s and trying to decide on caliber. I had a .504 that shot very well but I hear that the .451s are usually real good shooters. I plan to use the No Excuses bullets or something similar but the “sabot shooter” on Doc’s sight has me intrigued also. What are the pros of the .451 over the .504? (since I have not seen a .410 for sale anywhere it is out)