"(No one mention MD)"

"Depends on how much ammo you stockpile/scavenge and how much you have to shoot, including practice, defense, hunting, and self-defense on raids.

In terms of reliability, it depends on the gun. Your AR-15 or L85 (Dear God, the L85) will need a lot of maintanence to keep shooting after a few decades in the apocalypse. A Mosin-Nagant, on the other hand, will last practically an eternity; some Finnish guns have receivers a century old or older and they can still use them as sniper rifles."

"Depends on how much ammo you stockpile/scavenge and how much you have to shoot, including practice, defense, hunting, and self-defense on raids.

In terms of reliability, it depends on the gun. Your AR-15 or L85 (Dear God, the L85) will need a lot of maintanence to keep shooting after a few decades in the apocalypse. A Mosin-Nagant, on the other hand, will last practically an eternity; some Finnish guns have receivers a century old or older and they can still use them as sniper rifles."

"Regaredless of what you have managed to stockpile/Scavange/Trade if you take shots at everything that moves one day your going to run out of ammunition.

Saving ammo is incredibly important when the SHTF and the OP's answer of shoot everything that moves is going to get him in some deep sh!t."

"bullet casings are usually brass or steel, not straight copper
your "gun powder" is a crude recipe for black powder, which is smoky as hell and will clog up a dam rifle faster than you can clean it,

and what will you do for primers? (the thing that ignites the smokeless powder)"

"It doesnt matter whether or not I have experience, which i dont.
But my method IS correct, it isnt off the interent guide. Its a collection of internet information from various sources and how I would personally do it more or less."