It does in my .243 varmint rifle shooting 58 grain Vmax's on top of H4350 and in my 300RUM. I'm guessing the burrs left behind interfere with the powder ignition?
RJ
RJ
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Jack, My tool comes from the 1980's from the BR custom crowd (I think it is a Sinclair), long before the mainstream (Lyman, Hornady, et al) companies offered such 'luxury items'. Similar to the K & M unit shown below, it has a sleeve near the tip, just behind the countersink drill bit deburr tip (which also chamfers), that prevents any over depth effect, since it is non-case length sensitive.
Professional Steel Flash Hole Uniformer Selector
With this Flash Hole Uniformer tool, you can greatly improve accuracy by removing flash hole burrs while simultaneously reaming, de-burring and chamfering the inside of the flash hole.
kmshooting.com
The tip of mine looks like this photo:
Edit: Found it! This is like mine, they used a 'wire nut' to facilitate rotating the devise:
View attachment 107771
BTW: Mine is a K&M, not a Sinclair. Note the last paragraph:
K&M BR Inside Flash-Hole Uniformer
Review of 20 Best 6mm Shooting supplies--Redding Wilson Dies, RCBS APS primer tool, Harris Pod-Loc KMW Bipod, K&M, Holland neck Micrometer, Dewey Rods, Burris Rings, Wipe-out foam, Montana X-treme, Podlock Podloc, Harrell's Precision, MidwayUSA Tipton, Creedmoor, Edgewood Bags, and Benchrest 6BR...
www.6mmbr.com
Great pictures of what it means to uniform flash holes.
All my tools are copies of Sinclair, Wilson and others seen in BR catalogs or mentioned in magazine articles. I've adapted some tools to do different things, like turn necks on the lathe without having to turn it off and on. When you have tools you can make tools, too.
In 1969, I traded for a BR rifle with all the tools to make 6x47 cases uniform and 'right'. I've pretty much copied them on other projects and wildcats since then.
I traveled for a living for eight years an territory infested with pasture maggots so I made up a Kennedy tool box holding everything I needed to load three calibers in motel rooms including case prep. The base for several tools and ways to use them.
All my tools are copies of Sinclair, Wilson and others seen in BR catalogs or mentioned in magazine articles. I've adapted some tools to do different things, like turn necks on the lathe without having to turn it off and on. When you have tools you can make tools, too.
In 1969, I traded for a BR rifle with all the tools to make 6x47 cases uniform and 'right'. I've pretty much copied them on other projects and wildcats since then.
I traveled for a living for eight years an territory infested with pasture maggots so I made up a Kennedy tool box holding everything I needed to load three calibers in motel rooms including case prep. The base for several tools and ways to use them.
Attachments
Take a look back at my recent 'BTW' edit, I found a write up on that tool from an old 6mm BR.com site that gives a pretty good detailed review and it's operation/benefits. A good tool to copy.
Darkker, Nor have I, at least in the sense and definition of a 'hanging Chad', like the paper 'flaps' of the infamous 2000 election. That is not going to happen in this brass case example.
The burrs that I was referencing, and am most familiar with, are represented in the cutaway case on the left in this thumbnail image. If you click on it and + it, it is evident that the burr is more exaggerated, from about 7:00 to maybe 3:00, than the lesser burr on the remainder. I'm not suggesting that this has great significance as relates to variables in performance, only that it does exist. I agree with others, that it is just as likely to be a 'feel better' situation....to which I too have succumbed! How people choose to spend their time will forever be a curiosity. Another way to say that is; If a person is delusional about something long enough, it becomes their reality, so if no harm...no foul! And, I've been called much worse than 'delusional'!
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