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[The Hackmaster]

delete

 

[Duck_Hunter]

are you neck sizing or full length? What type of dies?

 

[CyaN1de]

Bullet type may play a part in it as well.

I was seating some 75grn A-Max the other day and was getting run-out up to .005

I took the seater stem out of the die and held a bullet to it. I found that the bullet had lots of wiggle room when held tight into the stem.

On the flipside, my Competition seater die for my 6BR has 0 wiggle room and I use anything over .002 run-out as practice rounds only.

Some companies now make a VLD Seater stem for this very reason.

 

[ben hunchak]

Use a comp. seating die which captures the case while seating and/or Coax press which allows case to centre itself.

 

[Dogleg]

If you are getting .002 at the neck, and .010 after seating the bullet your problem is with the seating die, probably the seater itself. The most common is a bullet tip bottoming out before the seater touches the ogive of the bullet.

 

[GSoD]

Competition seater from Forrester largely cured my previously maddening runouts. I've now upgraded to lapua brass to minimize neck runout.

 

[wild1]

Hopefully the hornady runout tool they have been advertising comes out soon. You can measure and correct runout with the tool according to the ad. Would be nice if it works.

 

[The Hackmaster]

delete

 

[Ganderite]

Probabbly your seater or the seater stem. I expect less than 4 thou on match ammo.

 

[Cummins4x4]

Use a comp. seating die which captures the case while seating and/or Coax press which allows case to centre itself.

I use RCBS Comp seating dies and the Forester coax, easily the most accurate ammo I have ever loaded.

 

[kombayotch]

...if it helps I am using a new rockchucker supreme press, and while the ram is not tight in the bore, I thought it didn't matter as the bullet was self centering in the case. Any ideas as to whats going on?

I posted a video not too long ago showing the kickout in the new Rock Chuckers. My buddy had the same problem. The solution was to get a new press (Co-Ax). The new RC is fine if you're criterial is just to make a bullet that goes BANG! But, it isn't the proper tool for precision. It is not the same quality as the old Rock Chuckers.

Congratulations on getting a useful tool that few seem to use.

 

[Duck_Hunter]

My Dad just got a new Lyman press. Its pretty bad the runout is high even using redding comp dies. To decap I've been using my neck sizing die without a bushing because if I use my lee decapper I have to actually tilt the brass so the decapper goes into the case! Same goes for when I use my K&M neck expander, brass needs to be tilted.
I usually use a Redding Boss press and recently switched to a K&M arbor press and wilson dies(<-my favourite setup) and runout is very minimal.