I doubt it but whenever you get some paint, try it. Put one in one end of the barrel, and blow through it. If it rolls out without blowing, the paint is too small, if when you blow it doesn't go through, the paint is too big. But, if when you put the paint in it maybe rolls for a bit, stops somewhere and then you blow it and it comes out easily, then you've got the perfect paint.
Just note down what paint it is and the rough temperature and so you will know whether or not to buy that paint again.
Shimples
Overboring is a bad idea on closed bolt markers like cockers. The ball sits forward of the detent when loaded, and can roll down or out of the barrel if tipped downwards. You'll either get missed shots or partial rollout, which effects velocity & accuracy due to range variations.Well not for me. If it rolls straight through the barrel, Im shooting it. If it gets stuck half way, I may get a barrel break mid game, and it could cost a tournament. I always overbore, and never have any issues. It doesnt effect efficiency, it doesnt effect accuracy, so why risk it?