My grandfather passed away a while back and i inherited a few shotguns and a .22 from him. a friend who is a hunter and cleans and cares for his own guns is teaching me. one shotgun was done for. it was completely rusted out but the other one is a winchester 20 gauge that just needed a little tlc so my friend is working on it and doing as much as he can for me. now you'll have to excuse me because even though i was raised in a small country town i haven't been hunting since i was 8. when my friend started working on the winchester it wouldn't open to load a shell. its a single shot where you push a lever and the barrel pops open at an angle to load and kicks out the previous shell. you load it, straighten it out. pull back the lever on top of the gun and fire. well we've run into a little problem. when you load the shells and fire, the lever pops forward every time but it doesn't fire every time. whats causing this? i know its hitting every time because the shells that don't fire have little circular nicks in the center. now if you load it and put the shell to where the barrel just barely closes it fires every time but if you just causally push the shell in and fire nothing. out of a box of 25 shells, 16 fired. so a few questions. what needs to be done to get it to fire every time? should i just take it to a gunsmith? and the ammo that didn't fire that just have small indentations, i should just dispose of those right? i've heard never reuse ammo that didn't fire because its dangerous. is this true? my friend said that originally but then said that it may be reusable because hes never had that problem and i should look it up.