Tip on flash holes that can ruin your ES

[Ggmac]

Don't forget that after the first firing , 5000 deg and 50,000 psi will reduce the burrs . Test it your self . It will not remove large burrs but will diminish them . I post this as testing I've done , not to start an argument . It's easy to test for yourselves .

 

[dmoran]

^^^ +1 .... my testing showed the same !.!.!

Chamfer's of depth, can yield earlier signs of detonation erosion and flash-hole irregularity, then a modest de-burring or slight chamfer - IME. More so after repeated firings/cycles.
Donovan

 

[ireload2]

An easy way to get rid of large raggedy flash hole burrs like the crown of burrs in a Remington case is to use a hand decapping punch such as made by Lee or Wilson. Give the punch a whack to knock out the primer, then about that much of a whack to knock the burr flat against the inside of the case head. The flattened burrs are much easier to remove with a flash hole deburring tool and you only have to do it once.

 

[LHSmith]

Then I presume you trust brass manufacturers to produce brass to such fine tolerances that no case prep is necessary?

What planet are you on?

I trust Lapua only, but i still verify each lot. since I shoot 6 PPC in Lapua cases, trust me , I got enough case prep to do.

 

[Rust]

I do remove burrs. A couple of year back one of my rifles started acting a bit funny. Inspection with a bore scope showed a big, thick, smeared metallic fouling. Had a few of the guys and my smith look at it and the consensus was that it was likely a burr that got carried down the bore and ironed in. It was a bitch to remove and had actually deformed a land. It was Winchester and examination of the fired brass and remaining new brass showed some healthy burrs. That's when I got serious about deburring. As stated previously, I eventually had a deburring tool reground so as to not chamfer, just deburr.

 

[Coolhand]

Something important I forgot to mention if you decide to uniform flash holes using number drills. Never accept that the size indicated on the packet is correct.
A #45 DB should be 0.082" or 2.08mm , a buddy bought a cheap set of 'wire gauge' drills, the #45 is his set measured .088" or 2.2mm, DON'T OVER SIZE FLASH HOLES, you should stick to around .0820"
If you find you have a few oversized flash holes, keep them segregated from your batch of 'match brass' and test them over a chronograph, you just may be surprised by the results.

regards
Mike.

 

[hunter243sgk]

I started de-burring mine when I got a batch of rem np 243 brass and noticed some of them had burrs so bad I had to turn them just right to see through them. That is the only np brass I have used but out of all the brass I have it was for sure the worst. Also I don't want those burrs shot out of my barrel as a couple posts talked about.

 

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Bryan Litz has a good test of flash hole deburring in his new book. I suggest reading it before jumping in and working on your brass.