Hi, i hope anybody can helpme with my problem.At any time, i was going to measuring the runout of my reloaded cartridges. And it was bad. The runout was 0.027" to 0.04".This is not the reason why i am reloading ammunition.The steps i was doing are:1. decapping without sizing.(Screwing the decapping pin out of the die as far as possible)2. cleaning the cartridges(thumbler)3. Lube the cartridges with caselube and fullsize them(i am talking about a .30-06 caliber for a semiautomatic)4. Trim, if necessary and chamfering5. Priming6. Charging the powder7. Seating the bullet.I use:Lyman pressRCBS ShellholderRCBS Die Set(Full sizer Die for the .30-06, Neck sizer Die for the .303 British.Redding competition Die Set for the .22-250With all these calibers i have the same problem.After discharging a loaded cartridge on the range, i have a measured runout which is less than 0.001".It is really bull**** to shoot with a .30-06 semiautomatic rifle and cartridges they have a runout more than 0.02" because slam-fire can occur.And the groups could be better with the .22-250.Now, i hope i can get help.

If it happens with all three, I would suspect your press. Odds of getting three bad die sets are pretty remote.

Might try measuring the runout after every step, which may isolate issues. Try resizing with no expander ball, measure runout, expand, measure runout, then seat bullet and measure again.

If resizing without an expander ball leaves bad runout, it's pretty much hopeless from that point on.

Any chance of borrowing another press?

Welcome to the forum, but please watch the language.

If you have little runout on fired cases, you know your chamber is aligned with the bore- that's a good thing.
Next time you're doing some loading, measure runout on some cases right after you've run them through the sizing die- before you prime, charge, and seat a bullet. If you observe significant runout right after sizing, your sizing die or sizing procedure is the problem.
If, after sizing, you still have little runout, you know your sizing die's good. Now, measure for runout after you've done all the steps and have a completed round. If you have significant runout at that point, the bullet seating die or procedure is the problem.
It's not unusual to encounter a sizing die or seating die with a fair amount of runout- in my experience, if you find that, the best thing to do is replace the die.
Think, too, about your shellholder- they can be out of line. Actually, so can presses. As simple a thing as a bit of dirt in the groove in your shellholder can cause runout, too.

One of the simplest things to do is to seat the bullet in increments while rotating the case an eighth or quarter turn as you seat. Some presses have a difference of offset between the die and the shell holder. That's one of the advantages of the Forster Co-Ax which allows the die to "free-float" to assure proper alignment between it and the shell holder.

Might try loosening the lock ring on your dies, rotate while bullet seating and then check your runout.

I concur it is the press since the 3 cartridges
he listed do not use the same shell holder defiantely the press.

I use:Lyman pressRCBS Shellholder

RCBS shell holders fit in the Lyman presses?

Quick history lesson. The now-standard shellholder was designed by Pacific (now Hornady) around WW II or before. Lyman, which is the oldest reloading equipment outfit, started using the standard shellholder sometime in the 1960's.

Now for the run-out problem. As said above, check for misalignment at each step. RCBS dies are known for this, and I have a .222 Remington sizer that bends necks. I found that sizing, turning the case half a turn and sizing again got rid of most of the runout, but new dies are better.

You can check your press for misalignment by making a peep sight for it. Remove the decapping pin from the sizer die, put a deprimed case in the die finger tight, screw the die into the press and see if the center of the ram lines up. Turn the die while you look through it, in case you have an off center flash hole. If everything looks OK, raise the ram and watch for it to stay centered. A case head sized disk of paper with a center mark or X in the shell holder helps you see if there's misalignment.

Cases that are thicker on one side than the other could be the problem, although they usually come out of the gun crooked. Your runout gauge probably can measure case wall thickness.

The .30-06 and .22-250 use the same shell holder, #2 Lyman or #3 RCBS.

Bye
Jack

Thank you for the fast answers.Today, i want to go to check my equipment step by step.If i found the problem, i will post it here.Heiko

this is one way you can try to find your problem, take the f/l die pull the decapping rod and run a loaded round up not all the way, just run it up to a little pressure then check run-out if run -out dose not improve then shell holder then seating die. Then if none of that cleans it up then try and borrow other dies then shell holder, also when seating bullet spin the case 180 at about 1 third of seating depth see if that helps! Thing of it is been reloading 25 years and can't remember a bad press, dies or such,couple casting molds
gave me problems but for the most part just me! Next 30-06 semi-auto as far as worry about run out, as violent as that action is run out? then if you are shooting the same reloaded rounds in the same gun why f/l size, neck sizing is a better way to to go that will help.The thing about run out is if the rifle does not shoot 1/2 MOA.you need to look at other problems first! and reloading does not make a crappy or good gun shoot great just tweaks it!
What I 'am trying to say here is don't worry about run out to much ,unless it's way out there there are other places to start.