Wilson micro seater die & arbor press

[paulT]

This is where I'd first look as well. Sometimes the smallest burr can cause the biggest problems. Also check straightness of stem.

Thanks for sharing info i will check seater stem out and where it contacts Bullet.

 

[paulT]

Already previously alluded to, but I will re-emphasize…. To truly eliminate runout, I have found that buying your own reamer, having your gunsmith run you a die body from a piece of barrel blank when you rebarrel a rifle. Slap a Wilson micrometer seater top of it, have a FLS die (with or without bushing) made from fired cases from your chamber by your favorite die maker. Turn the necks on you cases, anneal after every firing. It’s expensive up front, but save SO much hassle going forward. I just keep my cases sorted by number of firings. I can use the same cases and dies for multiple rifles. Seating depth is always dead on and I’ve given up checking runout because it just isn’t there anymore. At least, not enough for even the most discriminating reloader to worry about. Even stock Wilson seater have to have some “slop” (relatively) in dimensions to accommodate all chambering. Using your own reamer allows you to eliminate that relative “slop”. Neck tension issues go away too for the most part. Not saying it’s the Holy Grail solution, but its the closest I’ve personally come to one.

Might try placing thin tape to inside of die or the case to reduce slop just to test if it reduces seating runnout.

 

[denobravo]

I have found that with the bullet sitting on the case in the wilson seater that if I spin top piece of the die I believe it centers the bullet in the cone and reduces bullet runout.

I shoot NBRSA
the guy that was or is mentoring me said.."always spin the top before you seat the bullet"
I asked him why , he said it centers everything...
maybe he is right

 

[Bat Rastard]

Good question!

1) I've been searching for zero runout or close to it and come to the conclusion to buy 2-3 hundred new cases and sort. Then shoot the cases with best runout, then the next best , and finally the cases with worst runout and analyze the three results. See number 4 below.

2) Use a non-bushing full size die to set/size headspace and neck dimension. Haven't tried this , yet.

3) With a full size bushing die, neck size down in increments of 0.001 or 0.002.

4) Don't worry about runout if it's below 0.005"!

My $0.02!

A question about #4

Is that .005 total indicator runout?
Or +/- .005?

 

[paulT]

A question about #4

Is that .005 total indicator runout?
Or +/- .005?

Typical loaded round runnout was between 0.003- 0.004 3 to 4 thousands however i have managed to reduce overall loaded round runout by losening both the seater stem and die adjustment Lock screws.