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September 24, 2012, 10:07 AM | #1 |
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Do 9mm cases get bulged from unsupported chambers?
...so this is a well known problem with 40sw brass that get bulged when used in an unsupported chamber.
Does this happen with 9mm too? If yes, are there any dies to fix this? These cases are tappered and not stright; right? |
September 24, 2012, 10:30 AM | #2 |
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The barrels don't usually leave quite as much unsupported on the smaller diameter case, but it can happen, especially with +P loads. The 9 mm taper continues to the rim, so the rim is about 0.004" wider than the body at the datum 0.200" forward of the back end of the case head, technically making it a "semi-rimmed" case, but only very slightly so. The rim dimension has a -0.010" tolerance, while the 0.200" datum has a -0.007" tolerance, making the minimum rim only 0.001" larger than the minimum datum diameter. (See here.)
So, you can take the 9 mm Lee Factory Crimp Die, unscrew the crimp ring retainer cap and remove the crimp ring, then just use their bulge buster kit to push the 9 mm cases through. It'll take maximum dimension rims down slightly, but they will still work just fine. Worst case you'd have to deuburr the rim with a quick swipe over a flat file.
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September 24, 2012, 12:40 PM | #3 | |
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I do not believe you can "push-through" resize 9mm cases using FCD as the base is larger than the case mouth/neck - http://leeprecision.com/case-conditi...ge-buster-kit/
Quote:
Here's a bulged 40S&W case showing the "guppy belly" Here's a bulged 9mm case showing a smaller "guppy belly" (keep in mind that 9mm is a tapered case and the bulge shown is actually less than what it appears) |
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September 24, 2012, 02:02 PM | #4 |
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Interesting... the bulged 40 cases I was dealing with this past weekend were bulged at the base - near the extractor ring.
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September 24, 2012, 02:15 PM | #5 |
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BDS-THR,
Do you reload those .40 cases? Just curious, because I'm kind of scared to reload my bucket full of .40 guppies. If you do, what fps and bullet do you use? |
September 24, 2012, 03:18 PM | #6 |
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Never had an issue with any bulged 9MM case. I just did a test run of 25 9MM cases I fired that were Winchester Ranger T's 127 GR +P+ and all chamber checked in my Dillon Guage. Looks like my G-19's hold up well under the +P+ with no bulge. YMMV.
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September 24, 2012, 04:41 PM | #7 | |
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Quote:
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September 24, 2012, 04:45 PM | #8 |
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[Quote] Do you reload those .40 cases? Just curious, because I'm kind of scared to reload my bucket full of .40 guppies.
You can get a bulge buster kit or just send me the .40 brass and I'll put it to good use, I'd pay the shipping of course.
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September 24, 2012, 05:23 PM | #9 | ||
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Quote:
I reserve verified "once-fired" 40S&W cases that were not overly bulged (passed the resizing test) for max load data. For mixed range brass with unknow reload history I will use mid-to-high range load data. (even bulged cases loaded several times with "hot" loads and fixed with Lee FCD/Redding G-Rx "Glock Rx" dies that were dry tumbled/wet tumbled with S/S pins will look like any other spent case). For 40S&W, I prefer not to use faster burning powder than W231/HP-38. Mid-to-high range loads using W231/HP-38/Unique/Universal would be my suggestion for lower pressure 40S&W target loads. I use Montana Gold/Speer Gold Dot/Remington Golden Saber JHP and Berry's/PowerBond/Rainier/X-Treme plated and Missouri Bullet Company 18 BHN lead bullet for 40S&W loads. Quote:
Be safe |
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September 24, 2012, 06:25 PM | #10 |
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Yes. They also get bulged due to being loaded to 9mm Major levels.
If you can see the bulge, the case is damaged and should be crushed and thrown away. I use a Lee 9mm Mak FCD die body and their bulge buster to "iron out" my 9x19 and 9x21 cases. |
September 25, 2012, 04:05 AM | #11 |
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Thanks BDS. My worst "guppied" cases don't look any worse than the ones you've shown.
OP, sorry for the slight highjack. Now back to 9mm... I do reload 9mm, but I'm using a Lone Wolf 40 to 9 conversion barrel in .40 cal Glock. The LW barrel is tighter, so I do get very slight bulges. The Loadmaster progressive press and Lee carbide dies put mojo on them. I've reloaded a bunch of cases that have made three or four trips through my gun. |
September 25, 2012, 08:07 AM | #12 |
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They are not as big of a problem (40 isn't either) as many make them out to be but cases can get bulged. The ones that have the most problems are the ones we shoot through SMGs even 45 acp's have problem then.
I automated a casepro to roll size cases back to spec. It even cleans up and nicks in the extractor grove. No push through sizer can do that. |
September 25, 2012, 08:47 AM | #13 |
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^^ You win Reloader of the Year man.
Heck of a contraption. |
September 25, 2012, 08:53 AM | #14 |
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A fair number of my 9mm cases are adjusted by the Lee FCD down about where the "guppies" are shown in the picture. I've never had a problem reloading or re-shooting them.
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September 25, 2012, 02:04 PM | #15 |
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Shouldn't be an issue. Lube them, if necessary, to push the rim through, but it should size down. If you've ever run a .45 cases into .44 dies before by mistake, you'll know even thicker brass near the head can move a few thousandths with no problem. All you're worried about is not getting the rim so small the extractor can't drag it out of the chamber, and the FCD ring shouldn't make it that small.
Of course, if you're trying for bull's eye match loads, that smaller diameter reduces coaxiality of bullet alignment with the bore. For steel plates it should be meaningless, but for a 50 yard X-ring, you don't want to bet on it. But then, bull's eye target shooting loads are normally too mild to cause bulging in the first place, unless your chamber mouth's been significantly recut during accuracy work.
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