>>16363366yea alternatively your friend could just have the propellant and the projectile be separate pieces e.g lighting the fuze on a propellant package and then(quickly) putting the projectile(s) in next
also he can either make his own black powder or just buy reloading powder at gun stores it's everywhere
he could theoretically hypothetically be more ambitious and make a recoilless rifle which would be just as easy if not easier
