c.latrans,
Then what you're looking for is a sizer/lubricator, which will size the bullet, apply the lubrication and seat the gas check. The machines are made by Lyman, RCBS, Saeco and Magma. You may be able to pick up a used one for about half the price of a new one, except for the Star/Magma, which holds it's value right up at retail.
There's also a cheaper way to go with the Lee push through sizer dies. They don't apply lube, just size the bullet. You still have to lube the bullet before you run it through the sizing die, and there are several ways to do that.
Hope this helps.
Fred