Chamfering and Deburring Brass?

[Spyguy]

Is this only done after you trim a case to length? Or are there situations where you would need to chamfer and deburr a case even if it didn't need trimming?

[the86d]

I have only done it after a trim...

[drdarrin@sbcglobal.net]

Deburring is typically only done after you trim. Chamfering is done to trimmed cases or brand-new cases to help in the bullet seating process.

[Pauliedad]

I try to do a minimal (although consistent trumps all) clean up on anything I've trimmed.

One time I ignored the burrs for a batch of 100 .223 to see if I could detect I difference and frankly I couldn't until they were in an the bench ar that makes me look good.
Off hand and in the plinking guns they were fine.
I'd prefer to just have everything the same so even my plinking, loaded it on a progressive press ammo gets cleaned up after trimming.
Can't see a reason to unless they we trimmed.

[Divernhunter]

I like to chamfer the inside of the case mouth for better bullet seating. I find it does not shave the bullet that way.
When loading any copper bullet(Barnes,Swift) I find the bullets get shaved, sometimes badly, unless the case mouth is chamfered.

[Carcassonne]

Is this only done after you trim a case to length? Or are there situations where you would need to chamfer and deburr a case even if it didn't need trimming?

I don't usually chamfer 9mm, 40S&W, 45ACP, 38 spl, 223, or any nickel plated brass. I chamfer all my 357, 44spl, 44 mag, 444 Marlin, 450 Marlin, 45-70, 9x23, 45 Super, 41 Mag, etc brass even if it is brand new. I takes too much time to chamfer all my 9mm, 40S&W, 45ACP, 38 spl, and 223 brass. I just flare the mouth more to compensate so it doesn't shave off lead or copper from the bullet. The brass I don't chamfer is cheaper to buy 1x fired than the other calibers, so if flaring the mouth too much reduces the number of times I can use the brass it is almost irrelevant. For semi-auto brass the base gets chewed up faster than the mouth. The base is heavier and hits the ground (rocks or concrete) first which damages the base. Revolvers, lever-action guns, and bolt action guns don't toss brass on the ground like a semi-auto.





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[LynnJr]

SciGuy
Go to your local hardware store and get yourself a carbide burr used in highspeed die grinders.They run about $25 and work better than anything else you can use.
I put a knurled anodized handle on mine.Click on the picture to see what you want.

[Divernhunter]

I only chamfer or trim rifle brass. No need to do either to straight walled pistol brass.

[Spyguy]

SciGuy
Go to your local hardware store and get yourself a carbide burr used in highspeed die grinders.They run about $25 and work better than anything else you can use.
I put a knurled anodized handle on mine.

Thanks for the tip. I have a number of carbide burrs; I might have one that will work. Did you make that handle or did you buy it?

[stilly]

WOW It just dawned on me.

What if I were to setup two drill presses, side by side, one for chamfer, one for debur...

I could prolly pick up a drill press on CL for $40 or less... All they need to do is to spin. This would be great for use afterwards my CTS trimmer...

And yes, chamfer/debur is typically done after trimming...

[Spyguy]

WOW It just dawned on me.

What if I were to setup two drill presses, side by side, one for chamfer, one for debur...

Wouldn't you want 3 drill presses? One for your CTS trimmer, one for chamfering, and one for deburring?

And yes, chamfer/debur is typically done after trimming...

I know that chamfer/debur is done after trimming. I was wondering if it's ever done for cases that haven't been trimmed.

[45R]

Is this only done after you trim a case to length? Or are there situations where you would need to chamfer and deburr a case even if it didn't need trimming?

I will chamfer all my cases new or once fired brass. I only deburr And chamfer after trimming. It makes a huge difference as the neck doesn't shave copper off the bullets when seating.

[OldShooter32]

An electric case-prep machine is cheaper and takes a lot less room than three drill presses.

[highpower790]

Get yourself a Gracey trimmer with a carbide bit(from Bob jones),chamfer/deburr ,trim to length in one step,then upgrade to a 3000rpm motor...good times!

[stilly]

Wouldn't you want 3 drill presses? One for your CTS trimmer, one for chamfering, and one for deburring?


I know that chamfer/debur is done after trimming. I was wondering if it's ever done for cases that haven't been trimmed.

In an ideal world yes.
I would need three, but as it is, I barely have room for two, but if it was the same size it could work, three, no, now I gotta move around too much stuff. And I don;t wanna press my luck by getting two more drill presses.

Really though maybe just that lyman case prep center or one of those other case prep centers, whichever is cheapest that I can keep running next to the press to clean up the trimmed cases.

I had heard that you should check/trim virgin brass. but I think we already have that down.