Don't know if this is what you intended, but basically, for every bullet there is in a gun and you reload, it plays the reload sound for every bullet in the gun. It's not bad for reloading bullets individually as a player and not really noticeable if a gun only has the capacity to store a couple of bullets. But when reloading from empty the SMG, Tommy, AK-47, it's a little noticeable but especially the minigun, that's like a spam of reload sfxs and doesn't sound particularly good.

I'm using the 1.4.16 version of the mod in MC 1.20.1 and azurelib 1.0.25 and smartbrainlib 1.11.2