223/556 flash hole uniformer & pocket uniformer - MP-Pistol Forum

223/556 flash hole uniformer & pocket uniformer

This is a discussion on 223/556 flash hole uniformer & pocket uniformer within the MP Reloading forums, part of the Smith & Wesson MP Forum category; How necessary is it to prep 223/556 cases with a flash hole and pocket uniformer tool? I don't shoot that much rifle ammo as my ...


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Old April 15th, 2016, 08:47 PM   #1
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223/556 flash hole uniformer & pocket uniformer

How necessary is it to prep 223/556 cases with a flash hole and pocket uniformer tool? I don't shoot that much rifle ammo as my fave range is only 25yds max but wonder if the prep is worth the time for 9mm also. I'm thinking the flash hole prep would be more necessary than pocket uniformer as I already Super Swage 223/556 prior to running through a Dillon 650. I've read info and experienced a few misfires (mostly 9mm & VERY few) where the striker seems to hit too lightly on CCI primers though have yet to experience same issue with Winchester primers I'm presently using. Appreciate any advice from long and short gun loaders out there. Shooting S&W 9 & Shield 9, & S&W AR Sport.
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Old April 16th, 2016, 11:33 AM   #2
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If you are already running the brass thru the Dillon super swager you do NOT need to use a pocket uniformer tool. I have reloaded thousands of rounds of 223 range brass and the super swager is all you need to properly seat the primer.
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Old April 16th, 2016, 03:34 PM   #3
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I've fooled with this stuff quite a bit in precision rifle, crimped brass needs to have the crimp removed, I messed around for years in total frustration with a RCBS primer pocket swager, which was a piece of junk, and finally got the Dillon Super Swage which was one of my best investments. I've been using a flash hole uniformer for several years now, I'm probably going to quit using it, quite frankly after several years I still fail to see any difference in my rifle groups, if I competed in High Power rifle at 1,000 yards I might see some difference, but my rifle range only goes out to 300 yards and that's not far enough to see any difference in accuracy. While I haven't ever messed with a primer pocket uniformer, I think they are probably a solution to a non existent problem. All the above refers to rifles.

Now to pistols, if you aren't dealing with crimped primers there is no need to do anything to your primer pockets. I don't think there's a pistol shooter in existence that could legitimately tell the difference in the groups that any of those tools could make.

You mentioned a couple of misfires, misfires in reloads are almost always cased by failure to fully seat the primer. In addition when it comes to primers, people often refer to primers that are hard or soft, actually the differences in primers are sensitivity, some brands of primers are more sensitive than other brands. CCI primers are often said to be hard, they actually are the least sensitive primers of all the major brands of primers, in other words it takes a harder hit from the firing pin to set them off. Federal primers are often said to be soft, they are actually the most sensitive of all the major brands of primers, the easiest to set off. I have one custom revolver I used in PPC competition for years that the gunsmith warned me to only use Federal primers, any other brand would be unreliable, and in testing I found that to be 100% true. Winchester primers are a bit less sensitive than Federal, but much more sensitive than CCI primers, I like Winchester primers, I use them almost exclusively except for that one custom revolver. If you get misfires from CCI, Winchester or Federal primers should take care of your problem.

Primer sensitivity
Federal most sensitive (softest)
Winchester a little less sensitive than Federal
Remington a little more sensitive than CCI
CCI least sensitive (hardest)

This is one of my rifle groups, this is a 5 shot group shot at 100 yards from my custom AR-15 varmint rifle.

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Old April 16th, 2016, 05:55 PM   #4
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There is no practical value to doing all of the extra work in case prep. The only time it would be of value is in the case of a target gun where accuracy is measured in thousandths of an inch, and usually at hundreds of yards.
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Old April 17th, 2016, 05:00 PM   #5
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Thanks!

Thanks all, I agree completely. I happened to read several blogs on the subject from a retailer's site so guess they want to sell stock. Really appreciate G56's input and like Winchester primers as well; always thoroughly precise advice. I do not Super Swage my 9mm and suffer very few issues. Always swage my AR cases of course.
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Old April 17th, 2016, 08:35 PM   #6
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When I first started loading 9mm in the late 60's it wasn't that popular a caliber in the US at that time. The only way to accumulate fired brass was from classified ads in the back of the American Rifleman. The fired brass was almost exclusively foreign military brass and it was all crimped, and a lot of it had dates from the 40's. A lot of the 45 acp brass I was getting was donated to me as a young shooter from the 45th Division Reserve pistol team, when I went to the matches and shoot Bullseye, the pistol team had to turn in about 10% of their fired brass but would let me pick up and keep most of the rest, all military crimped 45 acp. Now you almost never see crimped brass except for 5.56/223, and virtually all of it is crimped, there's no need to swage brass if it isn't crimped.
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