Why would the OP want to use a bear banger?
Is it because the bear is perceived to be a potential threat? Or just for entertainment?
If it is because of threat perception; what is the outcome of that process?
Potentially bear finds OPs yard no longer attractive and happy; so bear now moves on to the next yard that proves an easy hit. Problem is still not solved. Just moved to someone elses yard, endangering them and their family.
Then there will be a new thread about how to get a bear out of a root cellar, or whatever. Bottom line, it is only moving the problem, and endangering someone else, who may not be saavy enough to deal with the problem.
If you are in the camp that thinks a bear banger is the ultimate solution, here's a news flash. That will NOT return Yogi to his natural wild state, happy to be in the woods, and away from human settlement. All it is doing is delaying an inevitable encounter, that certainly won't end up good for the bear. How it will work for the occupants of the next place he finds as an attractive grocery source, remains to be found out.
Give your heads a shake, and provide the OP with sound advice.