Originally Posted by
Northhunter
Challenger's are good shells. Very similar to original Kent Fasteel - the components are largely the same.
Hevi-Metal are decent shells with a good concept behind them and will kill birds, but sadly what goes into them does not warrant the price. Shot charge weights are usually light vs. what's printed on the box, and the alloyed shot they drop in on top of the steel is usually undersized and doesn't match up ballistically with what's behind it. Not worth the price!
As for "bang per duck drop", I would be more concerned with how many times you're pulling the trigger. 50 rounds an outing is a lot for something that has a limit of 6.