Yes, if you have to use bad paint, keep the velocity down. It does help keep it straight. Shoot about 260 fps instead of 280 or 290. Its noticeably more accurate.
stoffa15: You are correct, the proper size is best for efficiency and overall performance.
I use the larger size due to competition X-ball. I can't afford to have a ball break in the breach or barrel. I sacrifice efficiency for a barrel that will shoot anything I place in the chamber. As for accuracy, I don't notice any differences. Good paint goes straight, and bad paint just goes.
stoffa15: You are correct, the proper size is best for efficiency and overall performance.
I use the larger size due to competition X-ball. I can't afford to have a ball break in the breach or barrel. I sacrifice efficiency for a barrel that will shoot anything I place in the chamber. As for accuracy, I don't notice any differences. Good paint goes straight, and bad paint just goes.

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