I have had tremendous success shooting both the current Rio Bismuth 2 3/4 and 3 rounds at passing ducks out to 60 yards. Found them to be deadly.

Shot these in a 1930s English BLNE waterfowler by Betts proofed at 1.5 ounce. While it is a stout old gun and capable of handling higher pressures than a typical vintage game gun, I was never disappointed in the lethality of these modern bismuth loads. I dont doubt that TM is a more effective shot for vintage guns but they are twice the expense of bismuth. Rio bismuth are affordable and deadly!

Dr. P