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Where benchrest guys measure bullet runout?

They're not measuring...

But seriously, chasing concentricity alone, has caused me more headache than any other topic in reloading. My experience can be summed by: eccentricity does not affect group size so long as it is within reason. (call it 3 thou).
 
Dan depending on how little run-out you want ,I find, the cheapest was to greatly reduce run-out in a saami chamber is to use a Redding body die to size the case and bump your shoulder and a Lee collet die to size the neck. Works great for me. Low cost as well.

The reason so many people use the Lee collet die with standard chambers is because they get less runout than a bushing die.

That being said you will see the Lee collet die and Redding body dies in my photo below. And using the Forster die in one sizing operation still has the same or less runout than the Lee collet die.

You need to know how uniform your neck thickness is and check the case with your runout gauge after sizing. Then check runout after seating the bullet and if you can see the tip of the bullet wobbling like the OP that's far too much runout.

pltdloo.jpg
 
I also have a standard Forster die set with the expander set at it highest point. I still get less overall run-out with the body/collet die set up. I never tried the bushing die. I agree that you must check the neck at various stages of the loading process. Wobbling bullet tip is way too much.
 
Back to bedrock

I've also been chasing bullet runout and hope to find a more simple method for producing a "straight round".

No success-----yet.

Fact---I've checked many fired cases on a Sinclair concentricity device and have never seen any significant
runout on the OD of a fired case-----including the outside of the neck.

Logic---If the case neck had been turned we can expect the inside of the neck to also be concentric. If the neck
wasn't turned the ID of the neck would likely have some amount of runout.

Any bullet runout-----with turned necks----can only occur in the sizing and/or seating steps. Might be worthwhile
to check case concentricity after sizing.

As posted earlier, the Redding Body Die and Lee Collet Die make a lot of sense.

No complete answers here but something to think about.

A. Weldy
 
Are they’re any good reloading videos maybe on you tube for reloading for benchrest start to finish? If not that makes a good title for one of you to produce one.
This video series is pretty good. The guy is not shooting benchrest, but is doing long range PRS type shooting. The same techniques will get you started. Don't let all the experts scare you off.
Gary
 

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