I own modern guns for defence & shooting ferals, but I hunt with a flintlock muzzle-loading fusil. In a SHTF situation, there is the risk of running out of ammo for modern firearms if they are used for defence & for hunting, especially if you have to bug out away from home. Also there is the question of repair if one should malfunction.
My flintlock smoothbore is versatile & easy to repair. I carry spare parts when trekking, & long term if I should run out of spare parts I can turn my flintlock into a matchlock & continue using it. However, in all the years I have used muzzleloaders, I have only had two occasions when the hammer on a flintlock was not throwing sparks as well as it should. This was easily fixed by re-hardening the hammer in the camp fire.
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My .62 caliber smoothbore flintlock fusil.
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My .32 caliber flintlock rifle with double set triggers.
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My .70 caliber flintlock pistol with a left hand lock.
Advantages of a Flintlock Muzzle-loader.
1) Ammo is less expensive than a modern equivalent caliber firearm.
2) The smoothbore is very versatile, being able to digest round ball, bird shot, & buckshot, or any combination of two of these (can also use minies).
3) The fusil is lighter to carry than a modern equivalent sized gun.
4) You can vary the load if needs be.
5) The smoothbore will digest other projectiles besides lead.
6) Lead can be retrieved from downed game & remoulded with a simple mould & lead ladle. This means that you can carry less lead, & more of the lighter gunpowder.
7) You can make your own gunpowder.
8) You can use the lock to make fire without the need for gunpowder.
9) You can use gunpowder for gunpowder tinder fire lighting if needs be.
10) IF the lock should malfunction (these are very robust & it is not likely) you can easily repair it if you are carrying a few spare springs & a few simple tools.
11) If you do not have any spare parts & the lock malfunctions, you can easily convert it to a tinderlock or matchlock & continue using it.
12) You do not need a reloader, brass shells, caps, or primers. The latter have been known to break down in damp conditions or if they are stored for too long.
13) Wadding for ball or shot is available from natural plant materials or homemade leather or rawhide.
14) Less chance of being affected by future ammunition control legislation.
15) Gunpowder is easily obtainable providing you have a muzzle-loader registered in your name regardless of caliber (NSW)
16) A .32 caliber flintlock rifle is more powerful than a .22 rimfire, less expensive to feed, more accurate over a greater distance, able to take small & medium sized game, & other than not being able to use shot (unless it is smoothbore), it has all the attributes of the other flintlocks.
17) Damage from a .62 caliber-.75 caliber pistol or long arm is in the extreme. Wounded prey is unlikely to escape.
18) By using buck & ball you are unlikely to miss your target. This load is capable of taking out more than one target.
19) There is less kick-back to a muzzle-loading gun.
20) Antique Flintlock muzzle-loading guns do not require a license, registration, or a permit to purchase in NSW Australia.
https://www.youtube.com/watch?v=Ar8Jk0hFNXQ
Do not try to understand them, and do not try to make them understand you; for they are a breed apart and make no sense. Natty Bumpo, Last Of The Mohicans.