I received the Meister 165 grain .309 cast bullets and tried some.
In the Wells seating die, the casing shaved off the excess lead, leaving a lead lip where the bullet stopped going into the cartridge.
In the Lee seating die, the cartridge shoulder collapsed a bit before the bullet seated.
My Lee Loader (powered by a hammer) did a better job seating the bullet. However, it still has a lip at the end of the brass, where the bullet stopped going into the cartridge.
I'll have to research adjusting the sizing die. (None of the directions include anything on adjustments.)
Regarding the .311 lead balls... they work just fine! I have not shot one yet, but to load them, I just set the ball on top of the filled cartridge, and tapped it with a small wood hammer. It turns out the balls are not spherical, but they have so little area, it won't matter a bit.