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Flash hole deburring tool use

  • Thread starter Deleted member 10043
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Deleted member 10043

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Is it only useful on new brass because it seems to me that fired brass has pretty much obliterated any burrs on the inside of the flash hole. Also, seems to me that deburring should be an easy job that does not require a $30 tool.
 
Re: Flash hole deburring tool use

Remmy and WW brass benifits from flash hole deburring, Lapua not so much. Now, if the deburring isn't consistant case to case you really have not improved anything, hence the $30 dollar tool. What would use in place of the special tool.


OFG
 
Re: Flash hole deburring tool use

Firing brass does not remove the burr. Most brass has the flash hole 'punched'; others like Norma & Lapua are (i think drilled/milled) and do not have burrs. The de-burr tool I have has an adjustable coller that limits how far the cutter goes; it didn't take long for me to realize this was a waste of time and it's better to just feel my way. YMMV.
 
Re: Flash hole deburring tool use

I like this tool:
K&M

With the handle part off, chuck it up in a drill. It controls how deep the cut is.

RCBS Case Pilot Stops fit on this tool which really makes it work well.
 
Re: Flash hole deburring tool use

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MtnCreek</div><div class="ubbcode-body"> The de-burr tool I have has an adjustable coller that limits how far the cutter goes; it didn't take long for me to realize this was a waste of time and it's better to just feel my way. </div></div>

Exactly right.
 
Re: Flash hole deburring tool use

I find that flash hole de-burring is another of those "something to do with extra time" jobs. I visually inspect every case and flash hole when sorting. A quick look through will show any burr or "chad" that will affect the performance of the cartridge. Some can be removed with a hand held twist drill bit.

How many of those that deburr with the $30 tool also bother to check the flash hole size with a set of pin gauges. If not, it seems silly to do one without the other which probably plays a far bigger role in uniformity of ignition than a small burr.
 
Re: Flash hole deburring tool use

The tool I use will remove material from the flash hole if it's undersized. If oversized, it's easy to tell when putting the tool in the hole. I don’t measure / sort by flash hole size, but I will scrape an odd ball.

As far as effect on accuracy; whatever benefits are within my margin of shooting skill, so I can't say it does 'x' for me. I've not tested to see the effect, but crimped brass that's run through a super-swage will flatten the burr, sometimes covering a good portion of the flash hole. IMHO, that has to affect accuracy.
 
Re: Flash hole deburring tool use

The K&M tool will open up the flash hole if it's undersized.
 
Re: Flash hole deburring tool use

I use mostly LC brass and it seems to be the worst offender in the flash hole burr dept in my experience. I use a Lyman handheld deburring tool on any brass I want to use for accuracy purposes. It will surprise you the amount of brass removed just by cutting the burr away from the flash hole. The tool also uses a small drill point as a pilot to keep it centered in the flash hole-this uniforms the flash hole while de-burring.
 
Re: Flash hole deburring tool use

If I'm not mistaken, not only does the flash-hole deburring tool clean out the flash hole, it also chamfers the flash-hole inside of the case. I only shoot Lapua brass in my 308, and I use this tool on every case when I get a new batch. I ALWAYS get brass removal from EVERY case.
 
Re: Flash hole deburring tool use

The tool I use is slightly angled and could be used to chamfer the flash hole. For me, this is not desirable. My goal is to remove any burrs and leave the flash hole opening as square as possible. I don’t have any facts to back this up, but it just makes sense in my mind that adding a chamfer to the flash hole would more easily direct pressure into the flash hole. YMMV.
 
Re: Flash hole deburring tool use

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MtnCreek</div><div class="ubbcode-body">The tool I use is slightly angled and could be used to chamfer the flash hole. For me, this is not desirable. My goal is to remove any burrs and leave the flash hole opening as square as possible. I don’t have any facts to back this up, but it just makes sense in my mind that adding a chamfer to the flash hole would more easily direct pressure into the flash hole. YMMV. </div></div>

Most tool instructions call for just enough "chamfer" to remove the extra metal or burr. Not for a taper to the flash hole.

As for directing more pressure back through the flash hole, the same could be argued for the primer "blast" being more completely, and uniformly, directed into the powder column.

You'd be amazed at how many things are only important "in one's mind" and have little or no effect in the real world.
 
Re: Flash hole deburring tool use

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: MtnCreek</div><div class="ubbcode-body">Firing brass does not remove the burr. Most brass has the flash hole 'punched'; others like Norma & Lapua are (i think drilled/milled) and do not have burrs. The de-burr tool I have has an adjustable coller that limits how far the cutter goes; it didn't take long for me to realize this was a waste of time and it's better to just feel my way. YMMV. </div></div>

Somebody who posts here visited the Lapua factory and mentioned that Lapua cases aren't drilled, but rather, formed around a mandrel.

Still, I once prepped 200 pieces of Lapua 308 for a buddy and some of them had 'burrs' on the inside, not many but they were there.

The jury's still out on whether it matters, or not, but I do it for target ammo, not plinking. It's a one time deal, much like primer pocket uniforming.

I have the Lyman tool and I've used that for 17+ years and it still works well. I even have it installed on my RCBS Trim Mate.

Chris
 
Re: Flash hole deburring tool use

Nothing revolutionary there, Travis. Except it costs more than my K&M and it can't be turned by hand, another negative. I honestly cannot see where deburring flash holes requires chucking up in a friggin' drill press? Sissies!
 
Re: Flash hole deburring tool use

Mr. Garrett,

Thanks for the info on Lapua manufacturing!
 
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