My two bits here Devilish Pizza.
There is no substitute to actually shooting. Shooting ranges will rent out guns and should be able to give you safety guidelines(even better would be to take a defensive shooting class). Safety is key when handling firearms. The jams I have not been part of my experiences, so I can't speak to that. I can however speak to the enjoyment that can come from shooting safely.
As to your ability to survive a Zombie vs gun fight will come to quite the variables even if you are fully trained. Avoidance and diligence is always the better option(in my opinion).
Teethingbiscuit
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