Hi Bruce, Choke tubes in my opinion DO NOT reduce felt recoil. Now about tubes for pattern. If you are trying to put more shot 8 or 7 1/2 on your trap or clays targets then a extended choke may help this. In a hunting load, most pattern experts will tell you an extended choke makes no difference, the difference in pattern has much more to do with the size of the tube. If you want to reduce felt recoil get some weight in the back of your stock, I have a M-1 and in my opinion way too light. I have the stock loaded with lead.
Dave
Lower dram charge, Lower shot charge, heavier gun are the only way to reduce felt recoil.