Neck Bushing FL Die Question

[stool]

have you tried flipping your bushings over ?
seems there was some talk in the past that with the bushing inverted it sized differently.
just make sure the surface of the bushing is flat...the stamping on some caused them to sit at a small angle.

just one more thing to try

 

[savageshooter86]

Runout on fired brass is near zero. Needle barely moves on indicator.

I have CoAx press so the dies float. I tried bushing # down and # up. Both gave sane neck size of 3345

 

[BaconFat]

How is runout on your brass?

Well, they're all over the place. I use a dial gauge that measures down to one ten thousandths. So they all start out at practically .000 run out. Then some will end up with .0005 run out and some will be as high as .004. The majority will be .0015 to .002. For me, no better a shooter than I currently am, I figure this amount of run out is okay for now.

I was able to track down the fact that two of my bushings were causing an increase in my run out and I replaced those. I also figured out once the run out was introduced, it was there to stay. I didn't try FL sizing the brass because I figured a little run out was better than over working the brass.

 

[BoydAllen]

Bushing dies have their issues. The best results that I have seen, as far as runout is concerned, have come when we sized brass with a one piece die, measuring it, and then designing a reamer, for a tight necked chamber that gave the clearance and neck tension that we wanted. With that setup, you can have your die, without an expander, give you the maximum neck tension that you think that you will ever use, and then tune with an expander ball and/or neck thickness, to open things up .001 or more, without wrecking runout. Working from the die is a much more sure and economical method, and a one piece die that is a perfect fit for your chamber is the best there is.

 

[Immike]

I have been loading a 284win with two sizing dies. I have been using a regular FL redding to bump the shoulder and bring the neck down partially on turned brass. I then run it in my neck bushing die to bring the neck down the last bit. The brass has been staying well within one thousands run out. I will probably go with custom one piece dies in the future with other cartridges and do the math. I just managed to find a way to work with what I had.

 

[BoydAllen]

If you find a FL die that has a workable neck ID, a reamer is cheaper than o good custom die.

 

[Immike]

If you find a FL die that has a workable neck ID, a reamer is cheaper than o good custom die.

You are exactly right and I just about have that now. If I was shooting bare bullets I would not need to add this 2nd step to add only 1 thou to the neck tension. I turned my brass just a little too much.

 

[Barlow]

I tried several bushing dies and had nothing but problems (excess runout). I have been going to Forster custom neck honed dies and have found them to be excellent. Barlow