Nrut....sorry, didn't see your response until today.
Range on that group was 50 yds...I hope it will do well at 100m
The bullet on Toms catalog I think is now the 36-204AG....G for gas checked. It was just what I had initially , but he has changed the designations I think
The alloy was Magnum shot at 5% antimony and 3% tin....some said that would be too hard and brittle,,,,,,but I could pound those reject bullets on an anvil with a 5lb hammer and flatten them skinnier than a dime without fracturing them. Not on game I know, but I was pretty impressed for just using what I had left over and only wanting to see if the gun would shoot the bullet configuration.
Oh....and simply air cooled.