Comments on: Advanced Reloading — Checking the Geometry of Neck Bushings

By: butch Lambert

butch Lambert — Mon, 21 Nov 2016 19:00:29 +0000

Do you care to elaborate John?

By: John Perkins

John Perkins — Sun, 20 Nov 2016 00:36:29 +0000

More than likely heat treat fault.
Bushings were designed wrong from the start. John

By: butch Lambert

butch Lambert — Sat, 19 Nov 2016 20:43:48 +0000

I agree with Jim Borden. Also you should have some float in your die for the bushing. This will make the concentricity less important as your die will center on the neck. If the hole in your bushing is round and the bushing is perpendicular to its bore, you are good to go. Of course this assumes you have a good die.

By: Boyd Allen

Boyd Allen — Sat, 19 Nov 2016 18:07:34 +0000

The way that I have successfully evaluated bushings is to simply use a neck micrometer, taking multiple readings around the bushing, measuring the thickness between ID and OD. If you have the budget, carbide bushings are ground rather than turned and bored, which results in much closer tolerances. You may also be pleasantly surprised to see that your necks come out at the correct diameter. In the past I had thought that the reason that I got sized neck ODs that were different than my bushings were marked was because of spring back from work hardening, that is until I tried my first carbide bushing. They are pricey, but if you want the best bushings they are.

By: guy4064

guy4064 — Fri, 18 Nov 2016 18:01:47 +0000

I send my Forster dies to Forster with a dummy round and they hone them out for .002 neck tension for $20.00. Then remove the expander as its not needed. I get no more runout than whats in the un-turned neck.

By: Gene

Gene — Fri, 18 Nov 2016 17:42:00 +0000

I usually buy 3 bushings for each caliber I shoot. So should I buy three separate non bushing dies just to find the right one?

By: Terry

Terry — Fri, 18 Nov 2016 13:41:52 +0000

Thanks for the article.

I recently replaced a full length sizing die that varied .004 side to side.