Concentricity Gauge

Vince · Aug 8, 2013

Anybody use a concentricity gauge to deal with bullet runout?

I used some Cabela's Points to get one. I haven't had a chance to test my loads using them yet. Just wondering what folks say?

rick smith · Aug 8, 2013

Use the Sinclair model any time I am loading rifle rounds. Very handy when setting dies for the first time and checking case necks on fired rounds.Rick.

jimbires · Aug 8, 2013

I use the sinclair too .

joelkdouglas · Aug 8, 2013

Sinclair here also...but Cabela's doesn't sell it.

Looks like Cabela's only as the RCBS or Hornady. Of the two, I would get the RCBS. I tried the Hornady, and it gave different readings than the Sinclair. I guess the Hornady could have been right and the Sinclair wrong, but the Sinclair is tried and true. The Hornady is relatively new. Also, you can't measure brass runout with the Hornady, only bullet runout.

jimbires · Aug 8, 2013

I don't think the hornady one is the answer . I just can't buy into the thought of pushing on the ammo to straighten it . I'm going to say that after a round is straightened it's neck tension is going to be way different than one that was not straightened . especially with nice soft brass .

Oldtrader3 · Aug 8, 2013

I use a RCBS Casemaster Gauging Set. It will do headspace and a lot of other things besides just bullet runout (TIR).

BobT · Aug 10, 2013

jimbires":fat2w267 said:
I don't think the hornady one is the answer . I just can't buy into the thought of pushing on the ammo to straighten it . I'm going to say that after a round is straightened it's neck tension is going to be way different than one that was not straightened . especially with nice soft brass .

I use the Hornady with good success, typically though I don't have much runout to deal with. I have "pushed" a few bullets .003 or so and never really noticed any degradation of accuracy or velocity. I don't pay any attention to case runout except the neck and I use a micrometer to make sure that the neck thickness is uniform. If you have runout between the case body and case neck there is a serious problem with either the sizing die or the chamber.

Vince · Aug 10, 2013

I'll see what kind of results I get tomorrow.

khh · Aug 31, 2013

I use a RCBS concentricity Gage . Correcting bullet run out has made the biggest difference in my Hand load accuracy. I use a tool called a TruAngle. I just load my ammo as usual and add the TruAngle as my last operation. Its made a huge difference in my accuracy and constancy. I use to load and sort my ammo by run out . If I loaded 20 I'd get 10 good , 6 practice , and 4 barrel fouler's . Now all my ammo runs out less then .004 most times less than .002 . I tried the Hornady Ammunition Concentricity Tool it's based on the rim and body running the same most of the brass I have does not rendering it useless to me . TruAngle solves all that I would tell anyone loading they need to own this tool.

http://www.trutool-equipment.com/

good hunting KH

ElmerThud · Sep 5, 2013

jimbires":36ahm7zy said:
I don't think the hornady one is the answer . I just can't buy into the thought of pushing on the ammo to straighten it . I'm going to say that after a round is straightened it's neck tension is going to be way different than one that was not straightened . especially with nice soft brass .

I'd certainly share your view in this respect. I feel sure the neck tension would be different & variable between other cartridges, particularly those that hadn't been treated to some 'straightening'.

I think the problem of variable neck tension may be overcome by using the Lee factory crimp die as a 'final procedure' on all cartridges.
I've started using one and have seen an improvement in consistency.