Well, first the bullet doesn't get trimmed and primed, the case does.
With a 9mm I've never seen the need to trim it. And I've loaded thousands over the years. Straight-wall pistol cases, in my experience, never stretch so don't need trimmed.
I size/deprime, bell, prime, charge, load. Or (if using an older set of dies) size, deprime/bell, prime, charge, load (some of the older stuff, the decapping pin is on the expanding die, and all the sizer does is size),
But in either case, the priming is done AFTER the expanding. If for no other reason than that, every once in a while, you screw up a case. And if you primed it first, you either have to deprime a live primer (which scares some people) or toss a primed case, which wastes that three or four cents.
How deep? Depends on the bullet.
Jacketed bullet, you want the case mouth expanded just enough so the base of the bullet will fit inside. Cast bullet needs more expansion. It's hard to explain. Easy to see, but hard to describe. But, if you try a bullet in the mouth of the first one you expand, and it don't fit, you know you need more. And it's very obvious if you've expanded too much. But unless you have gone waaaay too much, you can still save the case, normally.
With a 9mm I've never seen the need to trim it. And I've loaded thousands over the years. Straight-wall pistol cases, in my experience, never stretch so don't need trimmed.
I size/deprime, bell, prime, charge, load. Or (if using an older set of dies) size, deprime/bell, prime, charge, load (some of the older stuff, the decapping pin is on the expanding die, and all the sizer does is size),
But in either case, the priming is done AFTER the expanding. If for no other reason than that, every once in a while, you screw up a case. And if you primed it first, you either have to deprime a live primer (which scares some people) or toss a primed case, which wastes that three or four cents.
How deep? Depends on the bullet.
Jacketed bullet, you want the case mouth expanded just enough so the base of the bullet will fit inside. Cast bullet needs more expansion. It's hard to explain. Easy to see, but hard to describe. But, if you try a bullet in the mouth of the first one you expand, and it don't fit, you know you need more. And it's very obvious if you've expanded too much. But unless you have gone waaaay too much, you can still save the case, normally.
