Concentricty guage

[brutus51]

Saw a video of the Hornady offering and I'm wondering if it's a worthwhile tool.
I can understand the value of having a bullet run true in the case, just makes sense but once the bolt slams the cartridge up the feed ramp is it still concentric?
Is the Hornady a good quality tool or are there better ones?

 

[Whiterook808]

I use mine, which is an RCBS Case Master, to judge the quality of my reloads. I don't check concentricity on every batch, but I do so when I am setting new dies, etc. The Case Master also has a probe that can be used like a paper clip test, except you have visual as well as tactile indication. That I use most often.

 

[Llama Bob]

I have the Hornady tool. I don't have any other tools to compare it to. I found it useful for measuring concentricity, but I found the "adjustment" feature to be useless. However it can clearly distinguish between match dies and standard RCBS dies.

I have tested to see if concentricity survives a hard chambering, and to my surprise it does with about .002 of neck tension.

 

[jmorris]

I can understand the value of having a bullet run true in the case, just makes sense but once the bolt slams the cartridge up the feed ramp is it still concentric?

I never bought one but I have made a couple. They won’t automatically make you shoot better but they can show you some things.

I have loaded ammunition that had some amount of run out, then chamber and eject, retest and it’s perfect.

That’s worth quite a bit, to be able to gain that knowledge.

Being able to test your cases after they are fired in a specific barrel is worth something too.

As is measure the wall thickness of brass.

It shouldn’t be the only “tool in the shed” and they are not necessary for decent results but they will allow you to put quantitative values to things that most people don’t.

These are some I put together.

 

[forrest r]

I have a Hornady concentricity tool and use it when I want to get serous with a couple of different bolt actions.

FWIW:
I use that same Hornady tool to check my pistol reloading dies, namely the expander die. You wouldn't think the expander ball on them would be out of round or bent. But a lot of them are and the end result is the bullets are not seated strait in the cases.