See H&K solved this problem a different way, if you damage the brass so badly on ejection it can’t be reloaded you’ll just have to use brand new brass every time.

Keith, I follow you for quite a while because of your analytical approach to shooting issues - Compliment!! I am myself concerned with the donut issue(s): I found that there are obstructions at the base of the necks of often used cartridges AND also with brand new ones when the necks are opened with a mandrel (f.e. when the factory necks are too tight). The first mentioned phenomenon is caused by brass flow forward as everybody and literature is saying. The latter phenomenon is - I think - due to the support of the neck at the shoulder junction which coincides with the observation that the steeper the shoulder angel (all WSM cartridges) the more pronounced the obtrusion is versus f.e. 30.06 with its flat shoulder In this case I was successful with annealing the neck-shoulder section and consecutive mandrel procedure. The donuts of often used cartridges I successfully remove with handheld reamers the brass fixed in L.E. Wilson case holders. A usefull tool to detect donuts is a measuring pin in the corresponding diam. I buy them in 0,01mm (0,0004") graduation.

Your reloading bench is unnervingly tidy 😂

The Wilson internal neck reamer is designed to be used on fired cases. This means that if the case has already been internally reamed and you get a doughnut and still using the same barrel and chamber as when the case was initially reamed then you will not ream additional material from the neck wall. You will clean most of the carbon off but still have trace amount left, rereaming the neck will remove the doughnut material but this would be a one time only solution as you will be removing flowed material from the case web forward - same as as length trimming material source.

Thanks for this, Keith.

Thanks, I needed that and you probably saved me some cash. Happy New Year!!

There are two other options not mentioned to ironing out that doughnut. Full length sizing the case or using a Lee collet die. I'm a bit surprised this wasn't mention.

Thanks Keith!

Yes doughnuts do cause flight deviation, I have a ton of LC LR that has been loaded dozens of times and the "doughnut" become more present I noticed erratic fliers.

Keith, I think one factor to mention is the clearance between the loaded cartridge neck O.D. and the chamber neck I.D. The bare minimum is enough to let the bullet go. Benchresters cut it to 1 or 2 mils. But 4-6 mills or more is much safer, unless you check the neck with each reloading. You can achieve this clearance with reamer design or neck turning the brass. If the clearance is tight, you are set up for a bad experience with a doughnut, if it comes along. Better have some good safety glasses on, if that bullet isn't easily let go. By the way, special reamers are available for increasing only the chamber neck size.

As always, great video!

Excellent information

I just use non-bushing dies and follow it with a coated mandrel (I know, I should still lube it).

Thanks for the video. Be Safe

Interesting. I reasoned out the idea of not sizing the necks on my brass all the way to the shoulder junction while trying to sort out my donut problem that I just discovered on my 223 Lapua brass. I'm shooting 75g ELDMs that seat the boat tail below the case shoulder junction so short seating the bullet to avoid the neck shoulder junction is not an option. As I backed off of the depth of the bushing a bit at a time. I finally found a spot where I don't feel the donut when seating a bullet, and the loaded round cycles in and out of the chamber with no problem. Now I wonder if I will need to go one size smaller on the bushing to compensate for less neck tension by virtue of the fact that I'm sizing less of the neck than before.

Don't seat the boattail to bullet body junction past the shoulder/ neck junction of the case...You'll never have a problem. After 25 reloadings of 300 cases I've never had a 'donut'. I read this a few years ago in the Accurateshooter forum when i started loading for the 6 5x47l.

Thank you for the video. You mentioned something about copper to brass being a somewhat negative association? Then you showed some type of little bottle of something. Can you please expound on that?

I have some 1x fired LC 556 range brass that has these bumps just below the neck right above the shoulder. Seen this on 1x fired arms cor 223 brass too! Could this be someone's chamber? It was definitely there before I FL sized them. The arms cor 223 brass fired fine but never seen this on LC brass. I like pretty ammo and it makes it look funky.

What was the bottle that you held up in reference to solving the direct contact with copper and brass? Graphite powder?

What was in the bottle? I’m pretty new at this but I’m guessing it was a type bullet coating?

Is it possible that the best course of action is to just replace the brass at the point this really starts showing up?

Keith , what length freebore is your 284 win Thx

AUTODOD or IDOD! Drops mic, walks away!

Short Action Customs dies only size the upper 65% of the neck. 🎉🎉🎉

Why not spend a little bit of your winnings on getting some new Lapua brass and through out the donut problem.

The IDOD is the solution for 😀,all the rest is 🤮

20 firings...Get new brass. Problem solved. Time is money.