Bushing style fl dies

[Ranger188]

I have used forster fl dies for years,different calibers,with the expander installed I get less then .001 runout on outside of neck
i tried the redding s die I think its called,never could even get close to good runout on neck,I never have turned neck
i see where everybody are going to bushing dies? I just don’t get it?
I just target shoot

As others have said, take the expander ball out.
Then don't worry so much about run out. Most long time reloaders don't measure for it.
I've seen shooters test with .003-.004 of run-out and it didn't seem to make a difference.
With good equipment and reloading skills, it's a non issue.

 

[muleystalker]

The other thing a bushing die can help is over working the brass. Most FL non bushing dies size the neck down more than necessary the open them back up with the expander. With a bushing die you can control how much the necks are sized down ,only sizing as needed without over working the brass.

 

[josebd]

what is the doughnut concern? Ive read about this some,is this something to worry about?

 

[L.Sherm]

what is the doughnut concern? Ive read about this some,is this something to worry about?

It is if your seating into it.

 

[Bc'z]

The doughnut is caused by brass flow from sizing, the bushing only sizes the upper 3/4 of case neck leaving the lower portion of neck unsized.
If bullet preasure ring is seated above this area its of no concern.

 

[josebd]

ok,all i have ever done is full length resizing,never even seen doughnut in brass,bushing dies creat more of the problem????
sorry for the stupid questions,this is kinda new to me

 

[Bc'z]

ok,all i have ever done is full length resizing,never even seen doughnut in brass,bushing dies creat more of the problem????
sorry for the stupid questions,this is kinda new to me

Full length sizing causes the dough nut.
When you run fat case that's been fired into a skinny die, the brass has to go somewhere and that somewhere is up.

Bushing dies make the dough nut a non issue as the portion of neck that holds the dough nut doesn't get sized, it's when you size the whole neck and are using long heavy for caliber bullets that the dough nut becomes vary apparent.
Having your chamber throated to accommodate the longer heavy for caliber bullets will keep your preasure ring seated above any dough nut.

As an experiment FL size a piece of brass that has multiple firings with your Forster FL die without using a mandrel or sizer button, next gently seat a bullet.
If you feel it go from smooth to almost wanting to stop or even a lil pop as it seats deeper... that's your dough nut.
If your using a mandrel in your sizing process ,it's pushing the dough nut out and may be visible after final sizing.

 

[Dave M.]

what is the doughnut concern? Ive read about this some,is this something to worry about?

Don’t worry about this. You likely will never load rounds short enough to touch or interact with any donut formed. For newer reloaders, I’d say don’t worry about any donuts

 

[Webster]

I have used forster fl dies for years,different calibers,with the expander installed I get less then .001 runout on outside of neck
i tried the redding s die I think its called,never could even get close to good runout on neck,I never have turned neck
i see where everybody are going to bushing dies? I just don’t get it?
I just target shoot

You probably have 1 thou variation in neck thickness if you never turned the necks. That's different than the centerline of the bullet lined up with the centerline of the bore. Some competitors turn after each firing with the turner always set the same. This cleans up brass flow after each firing. If you don't shoot competition or your a fanatic about small groups I wouldn't worry about it. Does the body or the neck center the bullet to the bore? Even if you had zero neck runout, you have body clearance in the chamber that must affect how the bullet lines up with the bore?