the BFA is because they use a wooden plug in the end of the round and thats what catches it ,as it can be lethal if it leaves the muzzle , I don't know about Ak's but I have made some using wax plugs for my 45lc pistol and rifles and used a fast burning powder like #2 ( or shotgun powder ) otherwise it just fizzles and smokes , you could also try real B.P. for them as it doesn't need the pressure like smokeless does to make the power pack it full and use a wax plug to hold it in , it will not develop the pressures like smokless does so your breach will be safe . and it will have enough umph to propel a golfball ..
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