Flash Hole

Flash Hole
Reloaders of centerfire cartridges agree on one main theme: the finished cartridge, made up of a case, primer, powder and projectile, should be as consistent as possible when we finish. If there is no consistency, there can be no accuracy.
I was cleaning my spent .30-06 Springfield brass when I noticed a bit of debris in the flash hole of one of them. The flash hole is simply the little hole in the back of the cartridge case where the fire of the primer gets to the powder in the casing and ignites it. I usually pop out the old primers almost mindlessly, then I use a bit of cotton on a stick to clean around where the new primer will be seated.
It is during this activity that I really look at the case. Usually, I am looking for cracks or any irregularity in the shape as a clue to retire the case. In all my years I had never checked the internal diameter of the flash hole. Nor do I remember seeing it mentioned in the various reloading manuals.
With one case, it was obvious that there was some debris in the flash hole. It was probably gunpowder and primer residues or part of the old primer. As a matter of curiosity, I tried various drill bits to clear the material. I used a 5/64 drill bit to clear it and started wondering about the other cases in the bucket, so I checked all of them. I found variations in size of the flash hole, even among those from one manufacturer, but purchased in different years and among those of different manufacturers, even purchased in the same year.
When you think of all the work we go to in order that every round is the same, we should not ignore the size of the flash hole. If the size of the hole varies, then the time to reach a higher pressure will vary. The typical flash hole was about 5/64 inch across, but there was variability from too tight to pass a 5/64 drill bit to rattle room.
I became interested in the size of the flash hole, specifically whether there is something important about the 5/64 inch diameter. If manufactures picked a number, such as 5/64 inch, they must have had a scientific reason. I looked all around and cannot find an explanation for this number. If it was just picked by convention, then why not try something different? I got to thinking: what would happen if I drilled the hole larger and used a magnum primer instead of a standard primer? (Substituting a magnum primer should raise the MAP, without any other change. -Editor)
If the purpose of the hole is to get the flash into the powder, should not a bigger hole ignite the powder faster and reach a higher pressure sooner? Would not a magnum primer be better? Around here the regular and magnum primers are about the same price. We are talking about just the time to drill the flash hole bigger, say 8/64 inch, rather than 5/64, and see what the results would be. I painted the backs of the brass red to remember that it was modified. I only did it to 10 cases to limit the risk if things did not go right in the experiment.
I am pretty careful about procedures. What I found was that the median impact at one hundred yards was one inch higher with the larger flash hole. I held everything constant except the size of the flash hole. This could signify a change in either velocity or the recoil impulse. It is also likely the result of a change in the pressure curve, which could be dangerous and almost certainly means the published reloading data is no longer valid. The bottom line: clean and (if necessary) deburr flash holes, but do not enlarge them!
Looking back, the first flash holes were incorporated in the design of muzzle loading firearms hundreds of years ago. The purpose of the flash hole then called a vent hole or sometimes referred to as a nipple or cone, or in cannons called the touchhole, was to channel a bit of powder from the external to the internal through a short tube or vent. The flash hole was shaped like a funnel, being relatively wide at the top, so it would better catch the powder sprinkled from the powder horn. Then it narrowed, so it was small at the end where the main powder charge waited.
If the flash hole was too wide, the burning gases would blow back into the shooter's face. By trial and error, designers tried different openings at the top and bottom ends of the flash hole.
What feedback would a modern centerfire shooter get? When a centerfire rifle is fired, the expanding powder gas wants to flow both ways. The expansion of gases pushes the bullet out the chamber and through the barrel, simultaneously pushing the primer and case back against the bolt, which can lead to some interesting problems if the pressure is too great. If the bolt is hard to open, it is often a sign of excessive pressure.
The main advantage of checking your flash hole while reloading is to insure consistency, which relates to increased accuracy.
Copyright 2016 by Allen Schuh and/or chuckhawks.com. All rights reserved.

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4.7 out of 5 stars

947 ratings

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WARNING :
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4.7 out of 5 stars

947 ratings

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The cutting tip measures .080" (checked with a Mitituyo Quickmike). In use, with 2-3 turns, it will open your primer pocket flash holes to a consistent .081". If you are trying to stay within generally accepted norms of .074"-.078" (.076" +/- .002") for small primer flash holes (although my .223 Rem Norma brass typically has .078"-.079" flash holes and my military spec 5.56 NATO Lake City brass has .079"-.080" flash holes), or the generally accepted mil-spec large primer flash hole range of .078"-.082" (.080" +/- .002") , realize that this tool will open them up to .081" (verified using certified pin gages). I load for varmint hunting with small rifle primers, and that is acceptable, but it may not be for your needs (PRS, F Class, Benchrest, etc). All hole measurements were taken with certified pin gages. Also, the shaft is very, very tight on the neck of new, unfired brass in .223. You will have to wiggle the case mouth around and press hard to slide the case over the shaft to use the tool on 3/4 of the cases, which makes using this for large batches of new brass twice as hard as it should be. If you have carpal tunnel or any other hand strength issues, this will be a challenge. Best used on neck-sized (with expander ball or mandrel) new brass or once fired .223 brass, if you have that option.

maybe not a necessity but it did improve my standard deviations and extreme spreads. you be the judge. I'm convinced.

Great for use on brass that had their primer pockets punched when the brass was made. This often leaves a small brass burr inside the case by the flash hole that can impact the uniformity of the ignition. My stand deviation dropped considerably. Your mileage may vary depending on cartridge size, burr size and powder type. Simple and quick to use

I found this is great. I think this is now going to be part of my reloading process. This is a good thing to start before you begin annealing or neck turning. If you trim your brass and clean your primer flash holes with this and use a good resizing die, your groups will probably improve.

Amazon really did a bad job packaging the Uniformer. The box seams had burst open and the hex key was lost. Fortunately one from another Lyman order works well. The uniformer doesn't adjust as precisely as I would like, but seems to do the job.

Great for fixing flash holes. / Cuts a large size flash hole If you are getting super into what size the flash hole has to be I would not recommend. This thing cuts a large flash hole. I would get something more specific. If you are just doing it to give you the feel good and are learning great tool. 1.Things to consider when using this tool - What step am I on? This can make a difference weather or not the case has been sized and trimmed. - I found that if i do the flash hole after it has been sized and trimmed = consistency in uniformity - Keep the same case manufacture the same. I found if if i mix and match i have to constantly adjust the tool. Separate the cases and you will find some manufactures are strait trash in how they do it. - Once it is done. You never need to do it again. - If you use a power trimmer it fits. Pros: cuts fast and consistently once it is adjusted CONS: not as much control can cut to deep if you are to aggressive - Great tool for the price.

5.0 out of 5 stars

Clean and tidy

inexpensive. Works exactly as it should.

4.0 out of 5 stars

Well made and functional.

Good item handle comfortable will do both small and large flash holes rod is sized to go down to .22 neck sizes, with .3 neck sizes sometimes it won't line up readily with the flash hole.

Does exactly what t says on the box, comes with a he key to adjust for the length needed. Cuts uniformly and easily leaving a smooth finish

5.0 out of 5 stars

Cheaper to buy on other sites.

A cunning and effective device. Easy to use and Works!

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This handy tool removes internal flash hole burrs. Features a tool steel cutter which is inserted into the flash hole through the case neck. Adjustable stop collar allows use with any size case. Burrs are removed with a clockwise turn. Fits .22 to .45 Calibers. If you are looking for a handy reloading tool for deburring brass casings than look no further than the Lyman Flash Hole Uniformer.
"Brands That Perform" means something here at Lyman. Performance means more than just getting the job done. It means delivering value while advancing technology. Most important it means listening to the needs of shooters. In fact, the development of our products is most often directly linked to the feedback we get from our customers and the retailers who supply them. Whether pioneering the use of digital technology in reloading tools or reintroducing "antique" calibers and bullet moulds, Lyman continues to improve and innovate the tools and reloading supplies used by serious shooters and reloaders.
This handy tool removes internal flash hole burrs. Features a tool steel cutter which is inserted into the flash hole through the case neck. Adjustable stop collar allows use with any size case. Burrs are removed with a clockwise turn. Fits .22 to .45 Calibers.

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4.7 out of 5 stars

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Made of the highest quality materials Hunting reloading case trim tools Another quality Bushnell product Made in the USA RCBS Limited Lifetime Warranty For use with .22 caliber cartridges

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4.7 out of 5 stars

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Size: .22 Calibre Verified Purchase

Very easy to setup and use. You'll need a 2mm or a 5/64" allen key (not included) and a trimmed case to set the stop collar. You aren't trying to cut a funnel with this tool. You're just knocking down the rough inside edge of the flash hole left by the factory.

Size: .22 Calibre Verified Purchase

This works. Because it has the depth collar adjustment, it might be a good idea to: 1- resize 2- neck trim 3- flash-hole deburr 4- primer pocket swage Oh, don't mix your case manufacturer, FC and LC are different enough you'll need to tweak the collar, so sort first. I've got thousands of cases to process, so I admit to having chucked this into a drill. It isn't meant for high speed but my variable speed has a speed limiter on the trigger and keeps it reasonable, and it is fast that way. All this processing will have me gathering my processed brass to reuse, putting so much time and attention to it. Can't say this will help my shooting but the primer pocket swaging will be easier to do just right without the burrs.

Size: .22 Calibre Verified Purchase

Yeah, it works, but really just a stop-gap for better equipment. I own this and have used it...there's nothing wrong with what it does, but it is really slow. Move ahead to a stainless steal tumbler and save your money. You will get there eventually. The trick to reloading is to understanding what you spend money on. Not to sound like a snob, but I predict that you will keep this on your bench forever and not use it once you decide that there are more useful ways of avoiding this process. Good luck.

Size: .22 Calibre Verified Purchase

The tip has a slight burr on it but a few passes on a sharpening stone cured that. Other than that everything is as advertised and works perfectly.

Size: 7mm Calibre Verified Purchase

Once I received the tool and screwed the shaft into the handle and found that the mount within the handle was not centered, I did not apply much force to straighten it out and in the process the metal shaft broke off in the handle. The good news is I contacted RCBS and told them what happened, they did not hesitate to send me out a brand new one at no cost. The new one is centered more evenly and has not broke. I give RCBS customer support 5 stars but knock the rating of the deburring tool down to 3.

Size: .22 Calibre Verified Purchase

This tool works very well. I have the depth set to just create a very slight chamfer inside the case. Some cases I get nothing, but others, a lot of brass comes out, meaning that ignition of the powder may have been hampered by burrs in the case. It also works well chucked up in a cordless drill.

Size: .22 Calibre Verified Purchase

works great for deburring 223 casings, very happy with it. took a little adjustment to get the depth set and it was good to go. the shaft unscrews from the handle, I chucked it up in my cordless drill and can process cases very quickly

Size: .22 Calibre Verified Purchase

Many people will probably disregard this tool but in reloading I have found many casings that needed flash-hole deburring. Will this improve my lousy aim? No. But it will aid in consistent cartridge firings by helping the primer flash enter the flash hole.

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RCBS is a leading U.S. manufacturer of precision reloading equipment. Ever since 1943, when Fred T Huntington founded the company in the back of his father’s Oroville, California, laundry and dry-cleaning plant, the company and its employees have gone to extreme lengths to provide customers the highest-quality reloading tools and accessories.
RCBS offers precision engineered reloading products. Our most iconic being the Rock Chucker Press.
We pride ourselves in building the highest quality products that last for decades of reloading.
We offer a full line of single stage and progressive presses, as well as dies, powder dispensers, and everything you need to create your perfect reloading bench.
RCBS is proud that its products are made in the USA by Americans.
Our most popular items include our Chargemaster Combo and Chargemaster Lite powder dispensers and our Rock Chucker Press and Rock Chucker Kits.
If you're new to reloading, consider one of the many RCBS Kits to get you started. From there you can add Case Prep products and upgrade individual products to speed up the process or hone the accuracy of your special load.
Burrs left on the inside of the flash hole during manufacturing can cause erratic ignition. This handy tool automatically locates the hole and quickly removes the burr. A self centering pilot collar with an adjustab
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