Champfering 9mm brass

Pahonix · Apr 22, 2021

Yes, seating and crimping are done at the same time. I have a Lee three die set.

The shaving is from the brass, not the bullet.(bullets are coated).

I do not bell these probably as far as I should, it's a very very snug fit. In fact, the chamfering helps to seat the bullets.

Walkalong · Apr 22, 2021

Pahonix said:
I do not bell these probably as far as I should, it's a very very snug fit. In fact, the chamfering helps to seat the bullets.

Then you need to flare a bit more with lead or coated bullets.

Oh, and if those vertical scrapes on the case are from the 'crimp", you're over doing it.

Pahonix · Apr 22, 2021

Those scrapes are from the sizing die. I size and deprime before I tumble/clean. I've ran my finger across a lot of them and can't feel anything. Ive cleaned it multiple times, still does it. It's a carbide die and I started using case lube and it's helped.

Walkalong · Apr 22, 2021

.40 S&W and .45 ACP, but it's basically the same for 9MM, do just enough taper "crimp"
to remove the bell/flare on the shortest cases, which means the longer ones will get a
hair of inward movement at the case mouth.

Berrys 230 Gr RN .45 ACP Crimp Pic a.JPG

Walkalong · Apr 22, 2021

Pahonix said:
Those scrapes are from the sizing die. I size and deprime before I tumble/clean. I've ran my finger across a lot of them and can't feel anything. Ive cleaned it multiple times, still does it. It's a carbide die and I started using case lube and it's helped.

You might need to clean the carbide ring, it may have galled and have tiny bits of brass adhered to it which are scrapping the cases.. Polishing it with 400 or 600 grit sandpaper will get out the brass, and can't hurt the carbide. Spin the die or some rolled up sandpaper, either way.

Pahonix · Apr 22, 2021

Walkalong said:
You might need to clean the carbide ring, it may have galled and have tiny bits of brass adhered to it which are scrapping the cases.. Polishing it with 400 or 600 grit sandpaper will get out the brass, and can't hurt the carbide. Spin the die or some rolled up sandpaper, either way.

I'll give that a try, thanks!

derek45 · Apr 23, 2021

I seat and crimp separately. 550B and XL650

It never made sense to me to push a bullet into the case while squeezing the case.

Walkalong · Apr 23, 2021

Done correctly, it isn't.

Champfering 9mm brass

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