I just agreed to buy a pile of shotgun loading manuals in the classifieds section, that will give me some good reading.
Im going to have to look for pressure and warning signs even if loading only to the manual. I know myself well enough, this kind of loading has me interested, Ive loaded plenty of Fclass and other ammo but I cant do anything beside ladder test, this is different.
This reminds me of around 25 years ago a teenage kid with a potato gun at my parents apple tree. I discovered one day that a 2oz Dixie cup made a perfect gas seal for a 2" PVC pipe. I didnt know what a gas seal was but i could see the possibilities and I made my potato guns to unthread the barrel and load into the bottom. I found I could then wrap a golf ball tight with paper towel and stick that into the bottom of the barrel with the dixie cup gas seal behind it, boy oh boy. I went to show my dad, he was plenty used to seeing me shoot apples 200 yards into the farm field across the street. Well, I aimed the golf ball into the air and they would travel out of sight in a straight line, they would shoot straigh over the whole field over the woods behind it, over the house behind the woods and into the farm field somewhere out of sight. My dad was shocked, he wouldnt let me do that any more, I dont think my mom even bought Dixie cups after that...