chamfer primer pocket edge?


September 22, 2003, 11:44 AM
Reading John Paul Jones' excellent manual on progressive loading, I noticed that he recommends chamfering the primer pocket lip. What is the benefit to this, and how necessary is this step?

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September 22, 2003, 12:31 PM
It's basically only necessary when primers are crimped into the pocket. That means military and surplus ammo are the only types that would need this done on a regular basis.

Black Snowman
September 22, 2003, 12:32 PM
This makes primer seating more relaiable. Some brass, Speer in particular, is already chamfered or radiused to help with this. I need to start doing this for all my progressive brass because the only failures I get in my Lee Loadmaster are primer related.

On my military .308 brass the primer pockets were cripmed and I HAD to chamfer them for a primer to go in at all.

September 22, 2003, 12:41 PM
A must if old primers were crimped.
Desired otherwise.
Ease of consistant primer seating.


September 22, 2003, 12:45 PM
IMI 308 brass already nicely chamfered. ;)

September 22, 2003, 09:36 PM
S&B is another one that NEEDS chamfered. That crap has REALLY tight primer pockets and will give you fits if you don't chamfer a little.

September 22, 2003, 09:44 PM
That's note even close to my experience with S&B.

Paul "Fitz" Jones
September 22, 2003, 11:13 PM
In my little "Blue" booklet that Sven is referring to I was talking about GI brass which I prefer over all brass if it is available in the calibers I reload and shoot.

The manual is "How To Live With And Love Your Progressive Reloader" By me and was included in all the progressive reloaders I sold in typewritten sheets in my Star and Auto Champ sales until C-H asked me for it for their factory output of Auto Champs to keep their customers from complaining about the Auto Champ when it was their customers selection of components that were causing the injuries and complaints. C-H printed a supply for me in the Blue booklet form with an Auto Champ picture on its cover but the information it contains is relevant to all progressive and other reloaders.

The Bullseye list last year caused me to reprint it a couple of times and I have some available. E-Mail me at for more information.

John Paul Jones
Star Progressive Reloaders Discussion Group

September 23, 2003, 01:01 AM

September 25, 2003, 12:58 AM
As an alternative to using a cricket to ream the primer pocket crimp, you can use the CH press mounted primer pocket swage, or the Dillon base mounted primer pocket swage.
If you have a lot of brass to do, the Dillon is really nice.
These do not uniform the depth of the primer pockets. That is a separate reamer with a bottom cutter. - Lew

Steve Smith
September 25, 2003, 08:07 AM
Or you could just buy processed LC barss that has had the pockets swaged. No need for chamferring. At least, not with a Dillon.

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