Shooters Forum banner
Cancel

Deburring flash holes

2247 Views 50 Replies 15 Participants Last post by  flashxl, 
F
Hi all quick question : dose flash hole deburring make any difference to accuracy ,only advantage i see is in large case with a magnum primer in very cold conditions to help with a clean burn........... (y)
Reply
Save
Like
21 - 40 of 51 Posts
K
Lyman hand tool which can be used in cordless driver or drill.
Reply
Save
Like
  • Like
Reactions: 3
F
OK ...Kdub thanks will look out for one , over in thing are bad when it comes to , powders , primers, projectiles , and every thing inbetween, things can only get better , lucky i stocked up aa..(y)
Reply
Save
Like
D
Read about that years ago and decided to try t. Made my own tool, drill bit in a wood dowel handle. Worked pretty good but I don't shoot well enough to tell if it made any difference at all! I don't shoot maatch rifles and all I look for is hunting accuracy and I get that and better from every rifle I]ve ever own except a couple and they went down the road. If I was a competation shooter I might have a different view of it!
Reply
Save
Like
JBelk
As noted above, there are two ways of controlling the depth of the countersink; one way is to adjust the depth from the mouth of the case. That means every case has to be freshly trimmed to the same length. The tool above stops on the base of the case. Either way the shaft should fit the neck so the center drill stays centered. I've got one for each of three calibers a load 'precision-style'.
Warren Page said in his book that just for kicks one year he didn't uniform or clean primer pockets at all.... and lost the usual number of BR matches. ;)
Reply
Save
Like
  • Like
Reactions: 2
S
I've only seen/heard of it 1 time, but a brand new piece of brass without any flash hole.
Reply
Save
Like
JBelk
I've seen no flash holes three times. All same caliber, same make, same lot. It was recalled. Speer made Browning marked.
It is a different kind of 'blow up' that really gets attention and usually ruins the bolt face.
Reply
Save
Like
  • Wow
Reactions: 1
S
JBelk said:
I've seen no flash holes three times. All same caliber, same make, same lot. It was recalled. Speer made Browning marked.
It is a different kind of 'blow up' that really gets attention and usually ruins the bolt face.
Click to expand...
It was found while deburring flash holes. I still uniform flash holes.
Reply
Save
Like
JWSmith1959
I also have the Lyman tool. I don't do every piece of brass but have done some batches for some specialty shooting.
Reply
Save
Like
H
flashxl said:
Hi all quick question : dose flash hole deburring make any difference to accuracy ,only advantage i see is in large case with a magnum primer in very cold conditions to help with a clean burn........... (y)
Click to expand...
Reply
Save
Like
H
Now that I see that it appears to be in the brass itself, I would likely not concern myself with it. Sadly
I cant zoom on your image.
Reply
Save
Like
JBelk
Flash holes are punched from the bottom so have burrs sticking upwards. De-burring is part of it, the other is making the distance the flame travels consistent from case to case. Called 'uniforming'. The reason why not is because it makes so little difference and it takes specialty rifles to demonstrate if there's a difference at all. Since BR shooters are all about perfection instead if testing, it's doubtful testing will be done. As mentioned above, Warren Page was a first page BR shooter and went a season without uniforming, deburring or cleaning his primers and 'lost the same number of matches'.
Reply
Save
Like
  • Like
Reactions: 2
C
HangglideShawn said:
Sadly
I cant zoom on your image.
Click to expand...
You will be, if you do this. Go back to my #13 Post and click on the thumbnail of the cutaway cases and click on it. It will open on another page enlarged. At the top rightish of that page you will see a small magnifying glass symbol with a plus sign (+) in it. Click on that and it will give a slightly larger 'zoom' view, and you will clearly see that the burr height is uneven around the circumference, as I explained in my post #19 above.
Reply
Save
Like
F
Ok all thanks for a wealth of information have tracked down a tool interstate my end , its a KM FLASH HOLE UNIFORMER now it comes in two sizes , was told .080" is STD again thanks you blokes.......... :)
Reply
Save
Like
C
JBelk said:
As mentioned above, Warren Page was a first page BR shooter and went a season without uniforming, deburring or cleaning his primers and 'lost the same number of matches'.
Click to expand...
Jack, the only caveat I will add is that since Warren Page's BR days a lot has changed. While he was certainly one of the 'Fathers' of modern Benchrest, the later BR crowd has, through experimentation in all areas of the sport (case prep. being a part of that), has advanced the sport a whole bunch, with group size 'telling the tale'. I'm betting the miniscule groups regularly showing up in todays match reports are not a result of 'Global Warming'. I think the mantra of the BR guys might be "While this (whatever it may be they do) may not help....it certainly can't hurt!".
Reply
Save
Like
  • Like
Reactions: 1
C
flashxl said:
its a KM FLASH HOLE UNIFORMER n
Click to expand...
Good choice, that's the one I have been using for about 35 years, as shown in #13 above, you'll like it.
Reply
Save
Like
F
Ok might be a stupid question but what cals dose the smaller one do PPC .062" ??
Reply
Save
Like
C
flashxl said:
Ok might be a stupid question but what cals dose the smaller one do PPC .062" ??
Click to expand...
Not a stupid question. The .080" hole has been the 'standard' for many years. The .062" hole is primarily found in the Benchrest (and long range) type brass, depending (a little bit at least) on the manufacturer (Lapua?), and yes, PPC, 6 BR, 6.5 Lapua, some 308 (Lapua Palma match brass). Some feel the small hole 'concentrates' the primer flame better to improve consistency of ignition, though some have experienced problems in cold weather with the small hole.
If you do happen to get some brass with the small hole, one has to be careful if using conventional reloading dies, the decapping pin may get stuck in the small hole and pull free of the die.

Here is an interesting exchange on the subject from Benchrest Central: 6mmbr brass prep - Page 2

Here is a good site that has a lot of info on a broad field of subjects: You are being redirected...
See less See more
Reply
Save
Like
  • Like
Reactions: 2
F
Bugger makes me want to go out and buy a 6mm ..............:giggle:.
Reply
Save
Like
  • Like
Reactions: 1
Clawed 1
Hey C.C. thanks for the link, there is some very interesting reading there.
Reply
Save
Like
  • Like
Reactions: 1
Darkker
You don't need magical innuendo from somewhere else, that was actually pressure tested and shared on this site. The Creedmoor primer test, measured the differences in burning curves and pressures. Specifically because those popular sites who never prove/justify their magic claims, said magical ignition can be yours for only $2/case.....🙄😉😉
Reply
Save
Like
21 - 40 of 51 Posts
Shooters Forum
A forum community dedicated to Sport shooters, owners and enthusiasts. Come join the discussion about optics, hand casting bullets, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more!
Full Forum Listing
Explore Our Forums
Rifles and Rifle Cartridges Handloading Procedures/Practices General Discussion Handguns Gunsmithing
Top