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**Shane Tuttle** · January 19, 2007, 09:07 PM

O.K. bear with me:
I happened to look down inside of my new Federal .40 S&W brass. I see what looks like the primer flash hole is "peeled back". Kinda looks like they "punch" the hole, leaving the leftover metal, well, peeled back. Looks like rose petals.
My question is:
Is it best to leave that, or do I deburr it?
I've deburred those in the past on other cartridges, believing that it interferes with uniform ignition of the powder.
Anybody have some input on this matter?

January 19, 2007, 09:07 PM	#1
Shane Tuttle Staff Join Date: November 28, 2005 Location: Montana Posts: 9,443	Primer flashhole irregularity O.K. bear with me: I happened to look down inside of my new Federal .40 S&W brass. I see what looks like the primer flash hole is "peeled back". Kinda looks like they "punch" the hole, leaving the leftover metal, well, peeled back. Looks like rose petals. My question is: Is it best to leave that, or do I deburr it? I've deburred those in the past on other cartridges, believing that it interferes with uniform ignition of the powder. Anybody have some input on this matter?