Fli-Right Concentricity gauge (pictures)
- Thread starter Grimstod
- Start date
have you checked your fired case for runout ? You should . Also recheck neck thickness again , Mark the cases with the most runout . A case will usually banana if one side is thicker than the other . Use these for sighters . You must have hit the lottery with your brass , remember I also shoot Lapua 7.62 x53 brass . The rules don't change . You headspace off the shoulder , if you insert a round bullet into an off center case mouth , then try to straighten the bullet , the neck which isn't concentric will be forced to be ,by the tool, by doing so will change the shoulder . The case body I think would also be straightened , so the shoulder is now not even . And this is what your head spacing off of .
What happens if you check runout as near the rim as possible ? What is the runout at the .200 mark , how about at the rim ?
The picture you posted of the burnished case neck ,along with your statement is useless . You must eliminate variables to come to such a broad statement .
Check cases , eliminate the worse , turn necks on those that are acceptable , then if your fired case have acceptable runout , rerun your test . Maybe as a blind test . Use marks ,small scratches on rim and have a friend hand you random cases . Use a large number of groups in varying conditions . Use wind flags , use a good bench or prone with a good front rest and rear bag . There are no shortcuts , if you think so your fooling yourself .
What is your chambers neck Diam? Should be on reamer print . What is your loaded round neck diam ? What is your sized neck diam , bullet diam , tension ?
Your choice of actions and the rimed round are a challenge .
Good luck
What happens if you check runout as near the rim as possible ? What is the runout at the .200 mark , how about at the rim ?
The picture you posted of the burnished case neck ,along with your statement is useless . You must eliminate variables to come to such a broad statement .
Check cases , eliminate the worse , turn necks on those that are acceptable , then if your fired case have acceptable runout , rerun your test . Maybe as a blind test . Use marks ,small scratches on rim and have a friend hand you random cases . Use a large number of groups in varying conditions . Use wind flags , use a good bench or prone with a good front rest and rear bag . There are no shortcuts , if you think so your fooling yourself .
What is your chambers neck Diam? Should be on reamer print . What is your loaded round neck diam ? What is your sized neck diam , bullet diam , tension ?
Your choice of actions and the rimed round are a challenge .
Good luck
You didn't start at the begining . What's your runout of a fired case ? What's your runout at .200 from base ? I'm not going to get into an argument with someone who is so stubborn as to build a Mosin , buy fancy tools without trying the necks . Come on , I can show you dozens of articles in Precision shootin that explain this much better than I can . Unfortunately I'm computer challenged and you don't live down the street.
You can't build a house on a faulty foundation .
You can't build a house on a faulty foundation .
I only neck size and it does NOT matter at 1000.......... the bullet will straighten itself out when chambering the roundzfastmalibu said:
Grimstod
Machinist, Designer, and Shooter.
Why does building a Mosin make me stubborn? I did it because it was fun and at the time it was all I had. Right now I am playing with a Borden action in 6mm BR, well if it ever gets here, they have like a 1 year lead time on their actions.
So as for checking runnout before loading them I do this on occasion just to make sure the dies are not binding. I sadly do not have time to go to competitions. Even getting time to play with this gadget is hard to find time for. Wish I was retired lol. No actually I would go nuts if I was retired.
Grimstod
Machinist, Designer, and Shooter.
I have been testing this on my new 6.5x47 Lapua. They brass has about .0005 of runout but bullets sometimes will get seated with up to .004 of runout. Fixing them in the gauge does not alter the bass as all the work done to the brass is within the limits of brass spring back. The brass is never altered by more then .001. Other concentricity fixers bend the brass more then .014 to fix minor issues.
BoydAllen
Gold $$ Contributor
I have tested quite a few concentricity gauges, and among them several that could be used to straighten. One thing that I can tell you for sure is that turned cones give the highest friction of all of the variations that I have tried. Also, I have come to the conclusion that these gauges are best used to diagnose equipment and reloading technique problems. There was some mention of ammo that had .012 runout. If I saw this, my first reaction would be to diagnose the source of the problem and fix it. Spend your money on better dies, and learn how to use them to your best advantage.
Grimstod
Machinist, Designer, and Shooter.
True, but even the worlds best dies will occasionally give you a random cartridge that has some runout. Rather then toss them into the fowling lot you can now straighten them and shoot with confidence. Never practice with crap ammo. I builds bad habits.
BoydAllen
Gold $$ Contributor
My good dies do not produce problem ammo. Of course they fit my chambers very closely, and I use good brass for any caliber that it is available for. Where I have seen larger runout numbers is when cases that were uneven in thickness were sized a lot by dies that were a lot smaller than the chamber that the brass was fired in. One of the last places that some shooters want to spend money is for custom dies or chamber reamers that produce chambers that are a close match for factory dies, but this is the place where investment produces great dividends.
Dusty Stevens
Shiner
What kind of ammo are you messing with? Im asking because i dont recognize whats in that ammo box it appears to be rimmed? Also when you fix that runout what does that do to your neck tension? Im glad i dont have any dies that cause that much runout.
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