Flash hole question
- Thread starter RAY
- Start date
Looks pretty average for non-match type brass (Lapua, Nosler, Norma). I use a flash hole uniformer tool on mine to clean them up a bit. You get what you pay for but with a little bit of extra work you can turn out some consistent brass with Winchester or R-P brass.
http://www.midwayusa.com/product/729748 ... ormer-tool
http://www.midwayusa.com/product/729748 ... ormer-tool
DrMike
Ballistician
- Nov 8, 2006
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It can be beneficial on all new brass to true and primer pocket and deburr the flash hole. The ammunition will do precisely what it is supposed to do if you don't do this, but many people, myself included, want to ensure that brisance is sufficient to ignite the entire powder column.
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- #4
I have all the case prep tools and just bought the rcbs pocket uniformer today , it can be used in the station or be threaded in a handle .
There's set screw adjustment for depth so I got the calibers to measure it and it looks to be set at .128".
The Win. case is ball park for sammi, but Nosler is less than .128 " I don't remember now what the measurement was , I had start cooking !
So I take it that this discrepancy with the flash hole having a nick in it won't compromise anything ?
There's set screw adjustment for depth so I got the calibers to measure it and it looks to be set at .128".
The Win. case is ball park for sammi, but Nosler is less than .128 " I don't remember now what the measurement was , I had start cooking !
So I take it that this discrepancy with the flash hole having a nick in it won't compromise anything ?
RiverRider
Handloader
- Dec 9, 2008
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It's not going to help anything, but it's not likely to have any detectable negative influence either. I wouldn't sweat it for a moment.
Dr. Vette
Handloader
- Apr 16, 2012
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I find that it's not a nick, but rather where the "hanging chad" :shock: of brass is still attached from when the flash hole was punched. Odds are if you look inside the case you'll see evidence of this.RAY":1byccqdv said:
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- #7
DrMike
Ballistician
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These are examples of flash-hole deburring tools.
http://www.sinclairintl.com/reloadi...rsal-flash-hole-deburring-tool-prod39911.aspx
http://www.sinclairintl.com/reloadi...nady-flash-hole-deburring-tool-prod56189.aspx
http://www.sinclairintl.com/reloadi...ols/lyman-flash-hole-uniformer-prod44714.aspx
http://www.sinclairintl.com/reloadi...rsal-flash-hole-deburring-tool-prod39911.aspx
http://www.sinclairintl.com/reloadi...nady-flash-hole-deburring-tool-prod56189.aspx
http://www.sinclairintl.com/reloadi...ols/lyman-flash-hole-uniformer-prod44714.aspx
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- #9
OK , with my Lyman deburring tool inserted into the case mouth with a few turns , I deburred the above case.DrMike":7szcpvud said:
The primer pocket end was not reshaped by this .
The pocket uniformer did not correct this either.
I don't think the Lyman flash hole deburrer is designed to do the pocket end, but I went ahead and tried it anyway .
It did take care of the" hanging chad" , but it seems that it is not perfectly round anymore, ( this is the pocket end ) . I was not using force, just working it lightly.
DrMike
Ballistician
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Because flash holes on non-premium brass are punched and not drilled, they often are not precisely concentric.
Guy Miner
Master Loader
- Apr 6, 2006
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Truth right there.
And Mike - I'm not SURE how much good it does to de-burr them (inside the case) I've faithfully done it, but forgot on one batch of Win brass that I used in 600 yard competition... And my scores were roughly the same... Am thinking that reading the wind was a lot more important than de-burring the flash-holes.
Guy
And Mike - I'm not SURE how much good it does to de-burr them (inside the case) I've faithfully done it, but forgot on one batch of Win brass that I used in 600 yard competition... And my scores were roughly the same... Am thinking that reading the wind was a lot more important than de-burring the flash-holes.
Guy
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DrMike
Ballistician
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FWIW, Guy, after years of deburring flash-holes, I seldom do so anymore for the very reason you state. The flame from an ignited primer moves straight up the powder column, and only if the chad is actually blocking the flash-hole would it be a hindrance. Some tasks were performed for years because it had always been done that way. Thinking through the problem led me to alter my practise.
RAY":3nf8eyof said:
I use .131 for depth on K&M tool....... have no idea if that right or not.
Large rifle at .131 all small rifle and pistol I think is .122 IIRC
See K&M dimensions here http://www.kmshooting.com/catalog/prime ... -tool.html
Dr. Vette
Handloader
- Apr 16, 2012
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I bought some once fired LC brass recently that had some of the ugliest flash holes I've ever seen. Some were very clogged, and one primer pocket had not even been drilled. How these were ever fired in the first place was beyond me.DrMike":jwukuuoz said:
Needless to say they all got a lot of attention.
Oldtrader3
Ammo Smith
- Nov 6, 2009
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Dr. Vette":ig6ujrwt said:
Yikes, the "hanging Chad" rears its ugly head again?
So long as I have a flash hole I'm content.
Like Guy I dont think it's a major factor in accuracy. There are so many things that effect accuracy and I don't shoot good enough to warrant messing around with the flash holes.
Vince
Sent from my SGH-M919 using Tapatalk
Like Guy I dont think it's a major factor in accuracy. There are so many things that effect accuracy and I don't shoot good enough to warrant messing around with the flash holes.
Vince
Sent from my SGH-M919 using Tapatalk
Dr. Vette
Handloader
- Apr 16, 2012
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Oldtrader3":3un39xpt said:
Yah, I wasn't sure what to call it, but once the term popped into my head I knew that everyone could understand what it was.
:mrgreen:
Oldtrader3
Ammo Smith
- Nov 6, 2009
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Especially here in Washington!
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- #20
