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Flash hole deburr question

ToddKS

Gold $$ Contributor
I have some brass that I am trying to deburr the flash hole on. I have a tool (Lyman I believe) but it appears to be beveling the hole (which I have been told is very bad).

Is there a tool that will will cut the burr flush without creating the bevel?

I need the burr removed because I am priming the brass on a progressive press using a hold down die. The hold down is crushing the burr leaving the flash hole partially obstructed.

Appreciate any feedback on this topic as I have not previously worried about flash hole burrs but if I am going to prime the way I want to it appears this is a bridge I am going to have to cross.
 
ToddKS said:
I have some brass that I am trying to deburr the flash hole on. I have a tool (Lyman I believe) but it appears to be beveling the hole (which I have been told is very bad).

Is there a tool that will will cut the burr flush without creating the bevel?

I need the burr removed because I am priming the brass on a progressive press using a hold down die. The hold down is crushing the burr leaving the flash hole partially obstructed.

Appreciate any feedback on this topic as I have not previously worried about flash hole burrs but if I am going to prime the way I want to it appears this is a bridge I am going to have to cross.
Click to expand...
These are the nicest ones I have used. There is a built in stop next to reamer

https://kmshooting.com/flash-hole-uniformers/professional-flash-hole-builder.html
 
Redding large primer flash hole deburring tool has a "sleeve" around the cutter that prevents it from creating a bevel on the inside. The small flash hole tool also has a sleeve, but it is set higher, and looks like it will create a bevel, which is why I have so far not used it at all. Having said that - I find that if you use quality brass like Lapua or Norma, there is very little (if anything) that these tools will do to the flash hole since it is already basically perfect.
 
Straightshooter1 said:
I really like my 21st Century flash hole deburr tool for this issues as it does a great job and does it fast. Only like all their tools,it's on the pricey side.

http://www.xxicsi.com/flash-hole-debur-tool.html

The KB tool recommended in previous post above by K-47B look like a similar cutting head design, which is excellent.
Click to expand...
Actually after looking at the one you just posted, I like that one better. The km has that floating ball that rests on the case mouth. But it can move around while in use and have to hold it in place while using.
 
X-47B said:
Actually after looking at the one you just posted, I like that one better. The km has that floating ball that rests on the case mouth. But it can move around while in use and have to hold it in place while using.
Click to expand...

I use the K&M tool (I like the interchangeable cutters for large and small flash holes) and solved the moving ball problem with a $.40 spring from a hardware store.
Unscrew the handle part, place spring onto shaft on top of that brass positioning bushing, replace handle. Now when you insert cutter into a case the spring keeps the brass bushing centered in contact with and centered up in case neck. Problem solved!
 
spclark said:
I use the K&M tool (I like the interchangeable cutters for large and small flash holes) and solved the moving ball problem with a $.40 spring from a hardware store.
Unscrew the handle part, place spring onto shaft on top of that brass positioning bushing, replace handle. Now when you insert cutter into a case the spring keeps the brass bushing centered in contact with and centered up in case neck. Problem solved!
Click to expand...
That’s a great idea. Will try!
 
All I've ever used is a sharp 1/8" drill bit held in a small tap wrench. just a couple twists and it's clean.
 
spclark said:
I use the K&M tool (I like the interchangeable cutters for large and small flash holes) and solved the moving ball problem with a $.40 spring from a hardware store.
Unscrew the handle part, place spring onto shaft on top of that brass positioning bushing, replace handle. Now when you insert cutter into a case the spring keeps the brass bushing centered in contact with and centered up in case neck. Problem solved!
Click to expand...
was size spring? post a pic of the setup thanks
 
ToddKS said:
I have some brass that I am trying to deburr the flash hole on. I have a tool (Lyman I believe) but it appears to be beveling the hole (which I have been told is very bad).

Is there a tool that will will cut the burr flush without creating the bevel?

I need the burr removed because I am priming the brass on a progressive press using a hold down die. The hold down is crushing the burr leaving the flash hole partially obstructed.

Appreciate any feedback on this topic as I have not previously worried about flash hole burrs but if I am going to prime the way I want to it appears this is a bridge I am going to have to cross.
Click to expand...
The only way I have beveled it is I use too much pressure. It should only take a few turns to remove the burr. Mine is either Redding or RCBS. Would have to look. Don't put a lot of pressure on it and it won't bevel it.
 
73C19ACA-20D4-4461-981B-64F3317EBEBC.jpeg Pix of my tool... I don’t see any harm in a bevel. After the straight shank has cut the hole, the flare will cut the slightest bevel at the base of case / top of flash hole. I do this very gently, by hand, and certainly don’t countersink the hole in any way shape or form. The flare just sort of deburs the debured hole I guess?
 
I never could see a problem with a possible burr on new brass. After the first firing, and i am strictly fireforming the brass on the first or second firing anyway, the burr will be gone. I say, leave the flash hole alone.
 
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