M-M-M-M Donuts

[Pawnee Bill]

Just spent a couple of hours eating donuts out my new fireformed 6mm Remington brass made from Nosler 257 Roberts+P brass. Very satisfying, not very filling though.

 

[Benchrest Braxton]

how did you get them out?

 

[DLT]

Still waiting to hear along with Sigma

 

[NorCalMikie]

Push them to the outside with a mandrel and turn them off OR, seat the bullets "above" them, load and shoot. I have never had donut issues.

 

[std7mag]

I'm surprised your getting donuts going from 257 Roberts to 6mm Rem.

I haven't had the issue going from 7X57 Mauser to 257 Roberts.

I do have some cases that were given to me that were 30-06 necked to 25-06. Huge donuts in them!

That reminds me!
Need to get a 25 cal ID neck reamer!

 

[Benchrest Braxton]

Push them to the outside with a mandrel and turn them off OR, seat the bullets "above" them, load and shoot. I have never had donut issues.

i didn’t think you could push them to the outside with a mandrel

 

[deadidarren]

I must be lucky I have never experienced doughnuts necking down only necking up i to push them out with a mandrel and then skim with a neck Turner.

 

[Pawnee Bill]

how did you get them out?

L.E. Wilson inside neck reamer.

WILSON NECK REAMER | Brownells

Thick necks can cause high chamber pressures and erratic shooting. Wilson neck reamers remove excess neck material to insure adequate clearance exists between the case neck and the chamber. Also, these reamers can be used when forming wildcats fro...

www.brownells.com

 

[Forum Boss]

We might not have this Forum, which started as 6mmBR.com, had I not grown so frustrated with the doughnuts in my .260 Rem (necked down from .308 or necked up from .243 Win) that I swapped to a 6mmBR using Lapua 6mmBR brass. Bonus was, as you'd expect, considerably less recoil and far superior accuracy.

 

[markm87]

I just saw that neck reamer posted by someone on M4carbine.net. I may have to get one in 30 cal. I have a box of 300WM that I mash rings into the bullet ogive when seating.

 

[Pawnee Bill]

I'm surprised your getting donuts going from 257 Roberts to 6mm Rem.

I haven't had the issue going from 7X57 Mauser to 257 Roberts.

I do have some cases that were given to me that were 30-06 necked to 25-06. Huge donuts in them!

That reminds me!
Need to get a 25 cal ID neck reamer!

Not all had donuts only about 80%. They were just big enough to not the bullet pass through the neck.

 

[Phys86]

Can you actually see or feel donuts? I think I may have them.

How far up the case necks will they usually go? Wondering how far ahead of the neck junction I need to seat to avoid them

 

[deadidarren]

Can you actually see or feel donuts? I think I may have them.

How far up the case necks will they usually go? Wondering how far ahead of the neck junction I need to seat to avoid them

Yes if they are large enough to be a problem the way I found doughnuts in my 260 brass which was necked up from 243 is take a fired case slide a projectile in and where the shank boattail Junction hits the neck shoulder Junction of the case it will stop I did the same as previously stated push them to the outside with a mandrel and then took a light skim with a neck Turner at the neck shoulder Junction then fire formed no more problems for the life of the brass.
One thing I neglected to mention is I size the case before pushing the doughnut outside

 

[6BRA]

Resize and pin guage..it will come to a hard stop at neck shoulder junction with donut.

 

[JSH]

I must be lucky, I have necked UP thousands of cases and never had a donut issue (majority 223).

Necking down, some worse than others. The 20 and 22 BR were not as bad as I thought they may be. I am wondering if the 20 may show its ugly head after a firing or two.

 

[Coyotefurharvester]

I haven't had any issues with my 20p AR. I have used LC, new Win and some new pmc. Haven't formed any from new LC. I use a .201 mandrel.

 

[nmkid]

I noticed some members suggested doing a light skim and removing the doughnut. Would that weaken the neck where the doughnut is removed? I don't know so gotta ask as it appears I recently got some doughnuts. Also, is it possible to get a small doughnut and not have any issues with seating a bullet?

 

[Pawnee Bill]

I noticed some members suggested doing a light skim and removing the doughnut. Would that weaken the neck where the doughnut is removed? I don't know so gotta ask as it appears I recently got some doughnuts. Also, is it possible to get a small doughnut and not have any issues with seating a bullet?

If you are seating your bullets above the donut, you won't even know they are there.

 

[6BRA]

I fall into a different thought process on this. Donuts are much more significant and prevalent with bushing dies imo. Yes, my opinion. The adverse effects may not be seating a bullet as they are above the neck shoulder junction most of the time. I see neck tension being affected adversely. Neck tension can be manipulated in many ways. Uneven brass is inconsistent brass/ turned necks lighten tension and make things more consistent. Brass flows every firing...and it isnt just in length. Brass is almost alive. Just like a carbide mandrel can help iron out donuts with turning, a bushing pushing down around the case neck helps to promote a donut in my mind and typically on freshly annealed brass. Brass is soft. No arguments here...jmo

 

[PhilC]

Resize and pin guage..it will come to a hard stop at neck shoulder junction with donut.

That's how I found mine.