I've recently started getting into pyrotechnics again and was working on my ball mill jars when it hit me, instead of building them from PVC parts which end up costing around $10-$25 each for parts alone, how well would a large stainless steel water bottle work? I've been perusing Amazon and noticed that half gallon and one gallon size water bottle are relatively inexpensive, often under $20 shipped in the US. JB Weld/Epoxy in some lifter bars on the inside and voila, air/water tight mill jar for very little work, and cheap to boot. Is there something I'm missing here as to why these couldn't/shouldn't be used?
304 series stainless should be non sparking even if you wanted to mill BP, would be anti static, durable and easy to clean. Even if you didn't feel safe milling BP in them they would be great for single chems and inert comps. Bonus points they come in many colors for easy identification. There are multiple varieties and sizes to pick from, the wide mouth ones seeming to be the best bet.
Example bottle is 64oz and is currently $16.25, it costs me about $10+ at my "local" hardware store plus an hour or so of time just to make a single half gallon jar. Gallon size is more like $20+
Thoughts? What am I missing here?