Anything. From what I've seen, this paintb shoots good through almost any type of barrel. The bore size may vary depending on how old the paint is, how cold it actually is, etc.
Shoots great in cold or warm weather.
None that I've noticed.
This paint is great! My team shoots this in cold weather, and we all love it. It shoots much better in colder weather, but it also shoots very well in warmer weather. It is very brittle and breaks very easily; the same, if not better than hellfire. If you shoot it in those cold weather tournaments, you already have a huge advantage.
Shoot it in cold weather. Works better than any other brand of paint.