Necessary To Deburr 9mm?

[peeplwtchr]

Hi All-

New to reloading, starting with 9mm, using the Lee 4 die set. I have decapped a few hundred cases, and am not seeing or feeling and burrs after sizing/decapping. Is it necessary to deburr 9mm? This will be practice pistol training ammo (7 yds.).

If a grey area, wouldn't the crimping die help flatten any burrs?

BTW yes, I read the manual I currently have (Nosler), and I don't recall seeing a specific call out to this question.

Thanks

 

[buba68]

Hi All-

New to reloading, starting with 9mm, using the Lee 4 die set. I have decapped a few hundred cases, and am not seeing or feeling and burrs after sizing/decapping. Is it necessary to deburr 9mm?
If a grey area, wouldn't the crimping die help flatten any burrs?

Thanks

No it is not necessary to deburr your cases. I have loaded several thousand and never had to deburr any of them. I use the Lee 4 die set also and the 4th die will iron out any imperfections in the brass and if you flared the brass out a little to much to seat the bullet it will fix that too.

 

[twistytorn]

Where are you looking for burrs?

Did you trim the cases? In that case you may have created a burr that should be removed.

Are they cases with crimped primers? If so you will need to do something with the crimp material to allow new primers to be seated. You can use a drill bit or deburring tool to remove that material.

Need a bit more info to help...

 

[troy fairweather]

It's good to just take the edge off, it can make some problems appear. There's many but just a few off the top are. Makes seating bullets harder and can scrape the bullet, this could hurt accuracy on lead could make the lead foul the bore quicker. It helps keep the bullet straight when seating and from cursing the necks.

another thing it's the burr if there is one can come off and stick in your chamber, this can cause the cases to stick or even if there's build up for the gun to fire when it's not fully In battery.

 

[peeplwtchr]

Where are you looking for burrs?

Did you trim the cases? In that case you may have created a burr that should be removed.

Are they cases with crimped primers? If so you will need to do something with the crimp material to allow new primers to be seated. You can use a drill bit or deburring tool to remove that material.

Need a bit more info to help...

I don't plan on trimming 9mm cases, according to posts here. I believe pockets are not crimped based on responses here (Geco cases).

 

[peeplwtchr]

No it is not necessary to deburr your cases. I have loaded several thousand and never had to deburr any of them. I use the Lee 4 die set also and the 4th die will iron out any imperfections in the brass and if you flared the brass out a little to much to seat the bullet it will fix that too.

Cool thx, why I bought the 4 die set, based on assumption.

 

[twistytorn]

I don't plan on trimming 9mm cases, according to posts here. I believe pockets are not crimped based on responses here (Geco cases).

Then you should be good to go, no need to worry about deburring.

 

[peeplwtchr]

Then you should be good to go, no need to worry about deburring.

Thanks!

I'll save the tool for .223.

 

[bihj]

Only deburr after trimming.

 

[docbrown]

I have never trimmed a 9mm case and trimming is the only reason I cn think of for deburring or chamfering a case.

 

[peeplwtchr]

I can spend 120 minutes on youtube or 30 minutes here to find logical info.. Thanks guys.

 

[Random 8]

I've only deburred 9MMS one time, and it was part of an attempt to make match accurate ammunition. I compared with non-deburred ammo and could find no difference. I have never trimmed 9mm. Any that grow to over length go to the recycle can.

 

[Telum Pisces]

I have never trimmed a 9mm case and trimming is the only reason I cn think of for deburring or chamfering a case.

If loading lead or coated bullets it can help in seating the bullets. I have found that I can bell the cases a tiny bit less etc... Does this lead to increased case life due to having to expand the case mouth less. Who knows. But it does help the bullets seat better without stripping off the bullet coating or shaving the lead of the bullet.

 

[Dudedog]

Is it necessary to deburr 9mm?

Loaded and shot 50K+ 9mm, never trimmed a case, never deburred.

But if you want to.....

 

[buba68]

Loaded and shot 50K+ 9mm, never trimmed a case, never deburred.

But if you want to.....

Kinda like cleaning primer pockets before putting a new primer in. Some people are anal enough to clean them. I never do........like you said if you want to.

 

[peeplwtchr]

Kinda like cleaning primer pockets before putting a new primer in. Some people are anal enough to clean them. I never do........like you said if you want to.

No, I'm lazy.

 

[Ruger 15151]

The only time you need to chamfer the inside of a case is after you have trimmed it. Since there is no need to trim 9mm cases, there shouldn't be no burr to remove.

Rifle cases are regularly trimmed becasue they tend to grow with each firing. The chamfer the inside of the case neck to remove the bur that was created during trimming. Also, because you typically don't expand a rifle case neck, the slight chamfer helps seat the bullet.

 

[Walkalong]

I trim, chamfer, & deburr revolver cases.

I have never trimmed, chamfered or deburred an auto case.