Originally Posted by rich
It might be down to the fact that the Pro-T requires you to thumb the pellets in, and maybe there is an inconsistency to be found.
Sizing the pellets ought to make them easier to load, and reduce any potential source of variation here, but sized pellets will probably fly lower.
I have found that you do have to make sure the pellet is well seated to get any kind of consistency. That's something I tend to do on instinct now!