Max run out on neck after resizing?

[ClassCat]

I agree with jepp2. The runout on the bullet is most important. If you're not turning the necks, the runout on the outside doesn't really tell you much. The Forster die centers from the outside, not the inside. Lapua brass, just like every other brand, is not perfect. Here are some Lapua .308 cases with a light cut. You can see most didn't cut all the way around which means they had a thicker and thinner side. If you turn the necks, turn all the cases the same and try for a minimum of 3/4 of the surface cut. At that setting a good portion will probably be cut 100%.
View attachment 1051453

I agree T. But the purpose of cutting is to bring all the necks to a uniform size. I found that .013 usually accomplishes that for a 308.

 

[dcali]

A typical factory die with unturned necks ought to get you under .003". With my turned necks and factory Redding bushing dies used sans expander, I typically see roughly 1.5 thousandths just ahead of the case mouth. I'm not sure how you get much more than that, to be honest. Something is wrong if it's over .003" when using decent gear and cases.

As for how much it matters, you'll just have to test. Conventional wisdom says "not much". Mileage may vary.

 

[T-shooter]

I agree T. But the purpose of cutting is to bring all the necks to a uniform size. I found that .013 usually accomplishes that for a 308.

I agree. Depends on the brass. Some brands will clean up 100% at .014" like the Hornady case in the picture. I think my Lapua cleaned up at .0125" I don't worry about a small amount the cutter doesn't touch as long as it's enough to center the neck in the die all the way around. I don't like to get the necks any thinner than necessary.

 

[JFrank]

I would be curious as to how the Retired Gentlemen finds .002 runout unacceptable also how he achieves his runout goal of whatever that is.
And perhaps his credentials to go along with that.
Curious
J

 

[snert]

Learn to read the wind, then worry about .002 brass runout.

 

[josebd]

Learn to read the wind, then worry about .002 brass runout.

I don't shoot when there is wind

 

[Nature Boy]

Do you guys that turn the necks on your cases do it for the purpose of:

1. reducing run out
2. because the chamber dimensions require it
3. both
4. some other reason

 

[snert]

I don't shoot when there is wind

You live on the moon?

Nevermind.

 

[Richard Coody]

Do you guys that turn the necks on your cases do it for the purpose of:

1. reducing run out
2. because the chamber dimensions require it
3. both
4. some other reason

only my benchrest cases. in the pursuit of consistent controlled neck tension. one of many things i have tried that actually makes a difference.

does reduce runout as a side note. easy to understand why, especially if you use a bushing die, after you measure neck thickness variations on a few 100 cases. Even lapua cases vary in thickness .0015 or more in different points around the circumference of a single case.

 

[josebd]

And yes

You live on the moon?

Nevermind.

I shoot early mornings, usually no wind

 

[snert]

And yes

I shoot early mornings, usually no wind

No windflags, daisy wheels or probes i assume?

 

[JFrank]

I like the evenings, things are calm also at my range the Elk take over early and late so sometimes I have to go down and honk the horn to chase them off
J

 

[retired]

how do you shoot thru watering eyes ??

before I shoot my meal consist of Pinto beans & cornbread, then when I get ready to shoot I release the gas if it stinks real bad I shoot, if it don't stink I aint shooting

 

[JFrank]

how do you shoot thru watering eyes ??

That's mirage of its own type!

 

[Dusty Stevens]

And yes

I shoot early mornings, usually no wind

Theres only no wind if you dont have wind flags. If you got just one vane type and put it in your backyard to study while drinking your morning coffee youll probably throw the cup at the flag for lying

 

[Ledd Slinger]

Do you guys that turn the necks on your cases do it for the purpose of:

1. reducing run out
2. because the chamber dimensions require it
3. both
4. some other reason

*Control neck tension
*Keeping donuts at bay
*Runout
*And to choose amount of desired clearance in a custom spec tight neck chamber.

 

[msinc]

Josebd, here is a quick test you can do easy enough. Remove the expander from the die and set it up and full length size a case. Check the neck for run out...there should be zero. If there is run out give Forester a call and they will have you send the die back for repair or replacement. If it's zero reinstall the expander, but leave it loose. Resize another case but stop when you are coming out of the die right when the expander is in the neck. Tighten the expander and re-check for run out. It should again be zero {if the neck is concentric to start with}. If not, try again, if it still wont zero up call Forester, they will correct or replace the die. Forester dies are a little different in that the expander is up in the die further than most others and it kind of starts into the neck as soon as the neck get out of that part of the die...if that makes any sense. You probably will still see some bullet run out, but many reloading companies say and many others agree that .003" bullet run out is as good as zero on the target.
Not many can argue with Tony Boyer....if you read his book he doesn't have much to say about bullet run out, as if it is never a problem. Then again the average shooter is not jamming his bullets hard into the rifling to begin with either.

 

[msinc]

I like the evenings, things are calm also at my range the Elk take over early and late so sometimes I have to go down and honk the horn to chase them off
J

I get made fun of all the time by jealous shooters for having my own range....now I can honestly say, "But I don't have pet elk at my range"!!!!

 

[josebd]

Josebd, here is a quick test you can do easy enough. Remove the expander from the die and set it up and full length size a case. Check the neck for run out...there should be zero. If there is run out give Forester a call and they will have you send the die back for repair or replacement. If it's zero reinstall the expander, but leave it loose. Resize another case but stop when you are coming out of the die right when the expander is in the neck. Tighten the expander and re-check for run out. It should again be zero {if the neck is concentric to start with}. If not, try again, if it still wont zero up call Forester, they will correct or replace the die. Forester dies are a little different in that the expander is up in the die further than most others and it kind of starts into the neck as soon as the neck get out of that part of the die...if that makes any sense. You probably will still see some bullet run out, but many reloading companies say and many others agree that .003" bullet run out is as good as zero on the target.
Not many can argue with Tony Boyer....if you read his book he doesn't have much to say about bullet run out, as if it is never a problem. Then again the average shooter is not jamming his bullets hard into the rifling to begin with either.

I have .001 runout without expander ball

 

[JFrank]

I have .001 runout without expander ball

FYI if the expander ball is to shallow you can destroy the brass necks, I have pictures
J