my 284 winchester ammunition is resized and has one thousand or less neck run out
when i load the bullet with two different seaters i get 6 8 even 10 thousands run out...whats the next step to correct this issue

thanks

I squared my dies to my press and it helped a bunch.

Make sure the seating stem fits the tip of the bullet correctly. Helps to seat bullet halfway then turn case 180 and finish seating.

What bullet you using?

Die quality.
I'm going strictly Redding these days.

Generally if you arent setting your die up properly, it will induce run-out problems. If this is happening with 2 different die sets, you may want to change your die set up procedure.

I go cheap azzed RCBS and never have an issue keeping TIR at or under. 003".

one die is a forster bench rest seater with the sleeve
the pther is a lee seater not the best but i can usually get 3 thou or less with them
i loaded up some 25-06 earlier with a forster seater and had no problem getting 1 thou or less run out so i dont see my set up as an issue

Normally the Forster Bench Rest seater dies are awesome and don't induce additional run-out. my thoughts are that you must be running way too much neck tension..........how are you sizing them ???????????

Inconsistent neck wall thickness can be an issue, and is something most loaders never consider. Necks of fired cartridges from a true chamber and sized brass may register perfectly when measured on the exterior surface, and be all over the place in the interior. Shove in a slug, and all that variation will express itself.

Measure ones cartridge necks after each step in ones loading procedures. That will capture the event or source on your issue.

My solution was to simultaneously ream and outside turn the brass that had obvious issues.

How do you go about doing that?

full length sizing

https://www.24hourcampfire.com/ubbt...13271587/run-out-discussion#Post13271587

Mule deer has posted/ wrote a few articles on how to minimize run out. I have adopted his recipe and it works well for me. I have reduced my run out to under .002 but so far I have only used it for 308 win loads. My equipment is standard Redding dies,and Lee collet die. All loaded on an RCBS turret press. Fed, GM brass, annealing every other loading, candle method. Nothing fancy, but it works for me.

I remove the shell holder and use a piece of good flat stock. With the die in the press but loose I raise the ram and get the flat stock on the bottom of the die so it takes out all the thread slack. I then tighten my lock ring to the press slightly and secure the ring to the die with the lock stud. Drop the ram and carefully remove the die and finish tightening the stud on the ring, I prefer the Hornady rings.


I had a 223 die that would give large run out numbers and this took care of it.

B. Thanks for that info. I have not heard of that process before, Interesting! Thanks