Hornady new dimension dies, 204

[mikea5232]

I have a set and I'm getting horrid run out. Like upwards of. 010 on the bullet shank. I'm doing everything the same as i do with any other die sets, but these are terrible! Anyone use these before with good luck?

 

[hikfromstik]

What kind of press ? Did you clean them before hand ? I use Hornady dies on my 6.5 Grendel and I'm satisfied . .010" is a major variation . Something is definitely not right. Try taking it apart and clean good and put just a hair of oil around the seating sleave . It may be binding .

 

[jepp2]

Like upwards of. 010 on the bullet shank.

How much of the runout is due to the case neck, and how much is coming from the bullet seating?

The reason I ask, is my experience is that the Hornady dies undersize the case neck much more than other dies. So when the expander has to pull back through the neck to size it up, the potential to pull the case neck off axis can occur. I strive to have TIR of FL sized case necks at 0.001" or less. If the expander is opening up the case neck more than 0.0015", I can't meet that runout.

 

[mikea5232]

What kind of press ? Did you clean them before hand ? I use Hornady dies on my 6.5 Grendel and I'm satisfied . .010" is a major variation . Something is definitely not right. Try taking it apart and clean good and put just a hair of oil around the seating sleave . It may be binding .

Redding big boss 2 for the sizing, and rcbs jr. for the seating. Dies are clean, and lubed.

 

[mikea5232]

How much of the runout is due to the case neck, and how much is coming from the bullet seating?

The reason I ask, is my experience is that the Hornady dies undersize the case neck much more than other dies. So when the expander has to pull back through the neck to size it up, the potential to pull the case neck off axis can occur. I strive to have TIR of FL sized case necks at 0.001" or less. If the expander is opening up the case neck more than 0.0015", I can't meet that runout.

I think that's the problem in bold. I didn't turn necks on this brass so there is .001 or so run out on a fired case, after i run them through the die there is .003 or more runout on just the necks. And then the bullet....

But I've tried 4 different lubes for the inside of the necks and they all pull hard through the expander. The brass is once fired (in my rifle) hornady brass. And on a box of 50 there are 5 or so loaded rounds that the TIR is less than .003. I usually don't shoot hornady brass but maybe it needs to be annealed? I'm not sure what to do other than get different dies or contact hornady for a possible solution.

 

[hikfromstik]

Redding big boss 2 for the sizing, and rcbs jr. for the seating. Dies are clean, and lubed.

I'm sorry I should have included to take the DIE apart and clean not the press ,my bad. Taking the press apart would be a major PITA

 

[mikea5232]

Haha. I knew what you meant. The dies are clean.

 

[Tucker65]

Check the neck diameter on a piece of fired brass then take the sizing button out of your die and see how much the die is sizing the brass down. I'm betting it's way more than needed and when you're pulling the button back up through the neck it's pulling it out if alignment. I had this problem with a set of Redding dies and cured most of it by honing out the die some and a carbide button. I eventually went to a Lee collet die and problem solved.

John

 

[mikea5232]

I'll check that this evening