Roll Sizing Question

[Cameron]

Looking for an expert opinion on roll sizing 9mm brass.

I am having some trouble with the slight buldge left in my 9mm reloads. I

already have a Lee FCD on the tool head, but I still have issues. I am

planning on using a Casepro to roll size the brass from now on, and this

leads me to my question.

If I roll size to 38 super dimensions (.384) instead of 9mm (.391)

dimentions, is there a danger zone on once fired

brass?

Will this .006 smaller case present issues?

I would rather not spend $200 on a set of 9mm dies for a borrowed case pro.

Thanks for any advice.

Cameron

[warpspeed]

The bigger issue is the rim dimension on the 9 vs super.

the 9 is rimless so if you used the 38 super dies, you will never touch the rim or extrator groove, one of the biggest benifts, IMHO, of roll sizing brass in the first place.

If you want some 9x19 brass roll sized in the 9mm dies to compare, shoot me an email.

[Flexmoney]

Cam,

People talk about running brass all the way through (as in, up and out the top) of sizing dies. They use a ram/dowel setup to push the brass through a topless die. Have you explored that route?

[Cameron]

Flex,

That is an option, but is a slow and painful one compaired to the Casepro. But I will give it some thought.

Warp,

I agree with the rim. I had success running SC through Super Casepro, and I expect to be using common headstamp, once fired 9mm. So I really do not expect too much rim "fixing".

My immiadiate concern is removing the teenie winnie bit of buldge that keeps the gun out of battery when the chamber gets dirty.

[kevin c]

Cam,

People talk about running brass all the way through (as in, up and out the top) of sizing dies. They use a ram/dowel setup to push the brass through a topless die. Have you explored that route?

Can that be done with a case that is tapered?

Cameron, is the bulge actually causing feeding problems in your guns? As I remember, reloaded 9mm rounds may have a "coke bottle" appearance, because the resizing may narrow the case mouth of the unloaded case a bit more than a factory fresh case, and the bullet will expand the part of the case that it occupies a bit, so that it widens it back to factory spec. The part of the case near the head may look fat compared to the middle on a reloaded round.

Just speculating.

kevin c

[rishii]

I would check if the roll sizing will weaken the web of the case and cause a case head seperation.

if your worried about not chambering with dirty gun, it might be cheaper to have the chamber reamed a teenie weenie bit larger for relyability.

[Cameron]

An update.

I started searching for the issue I am having. After checking the ammo the would not chamber, I found the the slight "coke bottle" was not the issue.

I resized 10 cases and found that they would fit the chamber gage perfectly. The problem gaging occured when I seated the bullet at 1.165.

So, I seated the bullets to 1.145 and the problem went away. Next I measured the bullets. They were measureing .356. DING, problem found.

So now I have 5,000 rounds of .356 bullets that I am trying to explain to the manufacturer, are oversize. I am waiting on a return call now.

We will see.

[DougCarden]

Cameron, I would first get a Lee Factory Taper crimp die in 9x19 and use that with your combination before sending the bullets back(unless this is 9mm major, which could cause pressure signs at the high end of the spectrum...) I use the .356 150jrn in 9x19 and have had no problem with chambering, firing, and accuracy in my two match 9x19 guns, and yes, you will be squeezing the bullet a tad bit. There will be some naysayers, but I get my 147gr lead bullets from my caster at .357( so revo shooters can use them as well), run them through the Lee FCD die, and still no problems. I wanted to give you another option.

Good luck,

DougC

[Cameron]

Doug,

Yep, running 9mm major. Plus, my gunsmith recommends I do not run.356 thru the barrel. Premature wearing of the barrel can occur.

Thanks for the advice!

[jmorris]

to answer Kevin C's question. Yes. http://magmaengineering.com/item.php?id=7

[kevin c]

Thanks for the info, jmorris.

Out of curiosity, I spoke to one of the folks at magma engineering (Gene, I think was his name). He told me the carbide die on the Casemaster machines is sized to the diameter of the case at the base, near/at the extractor rim, where even straight walled cases are a least a few thousandths wider than at the mouth. Pushing the case through the die brings the base of the case back to spec, with the mouth of the case sized down only to the same diameter, not quite back to spec. There would be a larger difference at the case mouth for a tapered case like the 9mm. Because of this, Gene says the cases need to be run a second time through a standard resizing die to bring the rim back to true SAAMI spec., which, of course, is what we would do anyhow in loading them. The same mechanics also explain why rimmed cases don't agree with the CaseMasters - the rim would get swaged down if the die is at the case diameter, or there wouldn't be effective resizing if the die diameter is as wide as the rim.

I just learned a whole lot.

[hiropro]

Polish your chamber first after it is really clean and see if youstill have the problem. I would have to agree with another poster if the problem pesists ream the chamber a bit. Actually make a cast of the chamber first and see if that is a problem.

Hiro