Reply With QuoteYes it does correlate with accuracy. There are a number of tools for measuring the bullet run out. From Hornady,, and a host of expensive others that are custom made.
Does anyone check bullet to case concentricity and/or skew? How do you measure and what are your results? Can you correlate with group size?
tommyt (308)
Yes it does correlate with accuracy. There are a number of tools for measuring the bullet run out. From Hornady,, and a host of expensive others that are custom made.
Willing to give back for what the sport has done for me!
I measure with a Forster concentricity gauge although there are several such gauges available. See Sinclair Intl. site for several nice gauges. I've never seen any definitive studies on concentricity versus accuracy but it stands to reason that bullets that start straight into the lands would produce better accuracy. I try to keep run-out under .002". Anything with .004" run-out or more automatically become foulers. I've found that bullets jammed .010" or so into the lands will tend to reduce run-out when extracted and re-measured. (match barrels and chambers) Turning necks will also reduce run-out. Correlation? I can't honestly say yes. I do know that when I pay attention to the little details my groups get smaller and my confidence rises.
Last edited by gotcha; 06-15-2015 at 09:13 PM.
My buddy made this for me.
He made 4 of them and our group uses them regularly. There is one where the bearings are a little farther apart. They where made out of scrap bin material which made it cool. What we have found is with correct neck tension, annealed when needed, and good dies you rarely will see one with more than .002 or .003 R.O.. Rather than straighten the ones above .005 we use them as sighters.
Robinhood, you have a nice tool!
Originally Posted by keeki
Guess it doesn't really matter. If ya cant afford $15, you won't be buying much anyways
Has anybody just marked the case head with a marking pen then insert them all into the gun the same way?
yo
not yet altho it's going to be difficult to tell what diff that makes
tommyt
David Tubbs clocked his rounds by the runout. If you look on YouTube there is a couple hour long vids talking about reloading. I think they are from the early 90's but most of his process hold true today.
Some of the best shooters I've competed against do. Most of them were Benchrest guys.Originally Posted by yobuck
Thank you sir. What you dont see is where I spot faced them the diameter and depth of a round magnet in two places on the bottom. I epoxied them in flush. To adjust for different cases you just slide it over and put enough camber in it to drive the case rearward as it is turned.Robinhood, you have a nice tool!
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