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Author Topic: Cartridge Concentricity  (Read 777 times)

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Offline ken s

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Cartridge Concentricity
« on: December 05, 2004, 08:48:09 AM »
what is the acceptable runout on a reloaded round. anyway what do u guy's accept.help me out here. thanks.
                       ken s :?  :D
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Offline Iowegan

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Cartridge Concentricity
« Reply #1 on: December 05, 2004, 09:55:49 AM »
Depending on your intended use, runout can be as much as .005" or as little as .0005".  Once you break the 1 MOA barrier, fine tuning such as weighing each powder charge down to the finest degree, perfect bullet weight, bullet seating depth, mouth thckness, and runout become critical.

For a hunting gun, .005" would be acceptable. For bench rest competition, .0005" would be normal. Long range tactical and varment shooters seem to settle on .001" as max.
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Offline ricciardelli

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Cartridge Concentricity
« Reply #2 on: December 05, 2004, 10:23:31 AM »
"runout"?

Duh, when I open the fridge, and all the Pepsi is gone, then I know I have "runout"!

As for cartridges, when the printer stops printing, I know they have "runout" of ink.

But for reloading?  In over 40 years of reloading, and probably a number of cartridges that approaches a million (give or take a few), I have NEVER checked the "runout" on a single one.
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Offline Iowegan

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« Reply #3 on: December 05, 2004, 01:12:47 PM »
ricciardelli, You have led a sheltered life! I first started checking runout while competing in bench rest shooting. I still have my Forester runout gauge though I admit it has plenty of dust on it.

This one of the many reasonably useless things to check on a cold winter night when there's nothing good on TV, almost as important as flash hole testing. Now I'm happy if the round chambers and bolt closes. Somehow I still manage to shoot sub-MOA groups on a good day.

Go spend some time with the BR shooters. They'll show you some more reasonably useless things. You should start a list of "Reasonably Useless Reloading Tips" on your web site.
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Offline longwinters

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« Reply #4 on: December 05, 2004, 01:45:41 PM »
Now that would be very interesting.  Especially for those of us with less than a lifetime of reloading experience.

Long
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Offline jd45

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cartridge concentricity
« Reply #5 on: December 05, 2004, 02:00:08 PM »
Iowegan & Ricciardelli, no offense, but you guys are certified comedians.
jd45.
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Offline ken s

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Runout
« Reply #6 on: December 05, 2004, 02:43:35 PM »
Quote from: ricciardelli


 hey ricci. who pulled your chain. i ask a resonable question. an u give me smart ass. if i want smart i go to school. if i want smart ass i sure won't be seeing u.
    ken s   :shock:








Duh, when I open the fridge, and all the Pepsi is gone, then I know I have "runout"!

As for cartridges, when the printer stops printing, I know they have "runout" of ink.

But for reloading?  In over 40 years of reloading, and probably a number of cartridges that approaches a million (give or take a few), I have NEVER checked the "runout" on a single one.
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Offline ricciardelli

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Cartridge Concentricity
« Reply #7 on: December 05, 2004, 08:12:33 PM »
Quote from: Iowegan
ricciardelli, You have led a sheltered life!


Yup, sure has been sheltered...

The following targets are all 5-shot, 200-yard targets.

22-250


A different .22-250


6mm Remington


7mm Remington Magnum

An I never checked the runout on them...
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Offline ricciardelli

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Re: Runout
« Reply #8 on: December 05, 2004, 08:15:16 PM »
Quote from: ken s

 hey ricci. who pulled your chain. i ask a resonable question. an u give me smart ass. if i want smart i go to school. if i want smart ass i sure won't be seeing u.
    ken s   :shock:


Well, I sure hope you enjoy going to school...
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Offline roper

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Cartridge Concentricity
« Reply #9 on: December 06, 2004, 02:39:00 PM »
When you use standard type dies and do a runout it's to that die and not your chamber.  Br shooter make the round concertic to the chamber and all your trying to do is lessen the bullet distoration from the throat to the riflings.  In all the years I shoot Br I never saw someone with a runout deal we normally had our match rounds and only thing worried about was seating depth,neck tension and powder thats the reason most might use 50rds for the life of that barrel in fact I have some rounds that have seen two barrels.  I don't mean to be a smart ass but think there is acouple different styles of reloading today.  I've seen ricciardelli post  and  I agree with him for probably our style of reloading we don't do it.  Just my .02
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Offline jgalar

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« Reply #10 on: December 07, 2004, 01:49:21 AM »
If you roll the cartridge across the table and it flops around then it has excessive runout. :wink:
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Offline Reed1911

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Cartridge Concentricity
« Reply #11 on: December 07, 2004, 02:27:22 AM »
As with so many other things in re-loading each to his/her own.
Does it really matter is the flash hole is .0001 deeper or not? Does it really matter is the length of ogive is .0001 longer? Does it really matter if you use benchrest primers? Does it really matter if one side of the neck has .0001 more brass? Does it really matter if the brass all weights within .01g of each other?
These are all things each shooter has to ask themselves. We perform some of these tasks on brass for some shooters if they ask for it, and pay for it. If it matters to you, then it is significant. I cannot tell you that it does or does not matter. If it's physics of your gun, or merely a psychological condition that makes you shoot better it really doesn't matter. If your groups shrink because of it, then yes it does matter to you.
The problem comes in when a new shooter feels he has to do all of this just to shoot okay. It all lies in the teaching of ground fundamentals then work on the details. That is my .000001 cents:)
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