Okay I have a kooky idea. Some may not think this is safe, and I’m willing to listen to any concerns. I have an old 300bo barrel that I don’t have use for so I was thinking about making it into a blank firing setup, and then brewing up my own blanks. Basically I could do this with a flash hider too, the concept as I understand it is that the adapters plug the barrel to allow gas pressure to build high enough to cycle the bolt. I saw one adapter where they claimed the obstruction was even made as a weak link and in the case of accidental live round firing it would push the obstruction out. I’m not super concerned with that and I can paint this red or something anyway. But what powder and how much could be used for something like this? I’d want a little hole in front if for no other reason than to look like gasses coming out the front for realism. Also, how to hold powder in cases? Must they be crimped or is there another method? I’d guess that shotgun or pistol powder would be the choice but how much? Is there some sort of standard charge for blanks?