Redding fl bushing die ?
- Thread starter rebs
- Start date
True with my Redding.
No, the donut may be there in new brass.
https://forum.accurateshooter.com/threads/understanding-the-dreaded-donut.4060881/
No it does not cause a donut. It doesn't size the neck to the shoulder junction but doesn't have to. Been using these dies a couple decades and they work just fine. I have never had a donut.
Cfshooter
Silver $$ Contributor
I am not sure 100% but i have seen an "outside donut" on the bottom of neck where the bushing does not go all the way down to shoulder. As far as the traditional "inside donut" it just seems to form in some calibers regardless if using bushing die or standard FL die.
AlNyhus
Silver $$ Contributor
The outside 'lump' you see is not what's traditionally referred to as a 'donut'. It's simply portion of the fired case neck that hasn't been reduced in diameter by the bushing. This unsized area is thought to help better align the case in the chamber.
Cfshooter
Silver $$ Contributor
Wouldn't the ring hinder the case from seating properly, or all the way?
Nope. Fits just fine.
In my testing it does. After 20 firings, brass will chamber slightly harder, when compared to 5 firing. This amount of unsized is needed to make a difference.
Somethings wrong with your bushing, All of my redding type s bushing dies size my neck all the way down except the last .050 of neck that meets to the neck shoulder junction. Are you not installing the threaded nut that sets the tension for the expander ball? That needs to be installed between the bushing and end cap.In my testing it does. After 20 firings, brass will chamber slightly harder, when compared to 5 firing. This amount of unsized is needed to make a difference.
Ruger15151
F-Class Shooter (6BRA and WIN 284)
Doughnuts are caused by brass flow during firing, not by improper neck turning or bushing dies that don't fully size the neck. They are on the inside and NOT the outside of the neck. You can feel them with a dental pick or when you run a mandrel through the neck to set yoru neck tension.
Most high end full length bushing dies (Redding is not in this category) only size about 60%-75% of the neck. Some can be adjusted to only size 50% of the neck which is a tuning tool.
The bulge close to neck/shoulder junction you are seeing will never be larger than the diameter of the chamber. Many top shooters feel it helps center the case in the chamber.
Most high end full length bushing dies (Redding is not in this category) only size about 60%-75% of the neck. Some can be adjusted to only size 50% of the neck which is a tuning tool.
The bulge close to neck/shoulder junction you are seeing will never be larger than the diameter of the chamber. Many top shooters feel it helps center the case in the chamber.
divingin
Gold $$ Contributor
Does fired brass fit the chamber? If so, squeezing part of the neck down won't magically make that larger, so why would it not fit then?
Some people look at the unsized portion at the shoulder as a benefit - it helps to center the cartridge to the chamber without having to have the shoulder of the case firmly against the shoulder of the chamber.
^^^^^^^^^^^rebs^^^^^^^^^^^^
It was a test.
AlNyhus
Silver $$ Contributor
The lower unsized portion of the neck is just like a fired neck in the chamber...normally it will be .001-.002 smaller than the chamber neck size. So yes...it fits into the chamber neck without any problem.
If there's enough brass flow into the shoulder/neck junction, that can keep the case from fully chambering. But that's a different issue than the unsized lower part of the neck.
A good check for this is with a bushing that's the same size as the chamber neck. Flip it over so the chamfer is 'up' and use it like a go-no go gauge for the lower neck and shoulder/neck junction.
FWIW, I like to size the whole length of the neck on anything where I do a jam-seat into the rifling.
Good shootin' -Al
As do mine. I size only 1/2 of the neck on purpose. It produces better accuracy in my factory chamber.
It's my thought that it is a benefit being this portion of the neck fits the neck of chamber minus spring back on a fired case.
Did I explain that right?
As others have said, a donut is not something that forms on the outside of the neck, but on the inside. Even a true donut, I think of as a complete non-issue as long as the base of the bullet isn't seated into it or below. It's a catchy term that gets way too much attention as long as its below the seated bullet. If the bullet does have to seat below that point, the bushing not sizing that portion of the neck can actually prevent it from being an issue then too, if there is enough neck clearance and the bushing never pushes it back inside the neck. IOW, let it form and just don't push it back in. Again, this only works if there is enough neck clearance where the bullet never contacts it and it never get pushed back it.
Don't sweat them if you're not seating into it.
Don't sweat them if you're not seating into it.
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