your only hope of self-loading with blackpowder is long recoil (there are anecdotes of folks running blackpowder shotshells in Auto-5s) but that's still going to be a mess of cleaning
@FailusMaximus yeah, and Hiram Maxim was bedeviled by black powder fouling as a result...the Maxim gun was only made practical when smokeless propellants became a thing
@FailusMaximus I'd just leave it open to "which early machine gun (set a date it had to be invented by or something) would be best to put in an early biplane?"
@Green alright here, thought of something interesting btw...how would a humanoid infant (half-dragon) go about breaking free of their egg? would they inherit some special feature for that from their draconic ancestors? what would it look like from the inside?
@Shalvenay I'd guess either some kind of egg breaking claw, or maybe a small 'horn' on their elbow, or alternatively the egg weakens at high internal temperatures and the humanoid breathes fire on the egg. This second method does raise the question of how the infant survives the heat.