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Bullet runout?

 
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  #1  
Old 04-02-2013, 06:01 PM
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Bullet runout?

So how critical is bullet run out and when does it start to affect goup size. .005 or more? Would it be noticable when shooting at 100 yards............I would guess that all improvment add up to better accuracy but some within themselfs can make a noticable difference.

Has anyone used the Hornady Concentricity Gauge..........SO, it will eliminate bullet runout? Can it be used to measure case neck runout also?
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  #2  
Old 04-02-2013, 08:10 PM
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Re: Bullet runout?

I bought a Hornady Concentricity Gauge after watching Shawn Carlock use one on his reloading video. Plus I had Cabela points burning in my wallet. I will tell you my groups at 200 yds have shrunk from about 1 inch to half inch. Shawn said .002-.003 of an inch of bullet runout is acceptable but I can get them down to .001 with the gauge. I don't think the gauge can be used to find neck runout. The bullet sits in a indented shaft where you can spin it like a lath.

Bushing resizing dies are suppose to help with bullet run out. I did buy some from Redding but haven't set them up yet to see if runout is eliminated. Wanted to reload this batch of brass because I already had them resized with my old dies.



Jason
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  #3  
Old 04-02-2013, 11:27 PM
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Re: Bullet runout?

Your terms here would poison better responses.
BULLETS, are the heavy pointy things that fly downrange to your targets. There isn't any runout in them practical to measure.
CARTRIDGES amount to the completed ammo, including all components.

Cartridge runout amounts to a sum of skewing from loaded case AND seated bullet.
Cartridge eccentricity represents departure from a centerline(any), rather than departure from straight, or round(runout).
Concentric means same w/respect to a centerline. A cartridge can 'measure' perfectly concentric while presenting excess runout, depending on the measurement methods.

Just some things to think over here.
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  #4  
Old 04-03-2013, 06:19 AM
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Re: Bullet runout?

I have been using the Hornady since it was introduced. I really like the gauge, and yes, the straigtening devise will reduce the runout. I prefer to get my set up right from the start so I don't have to use it. I'm don't really know the effect of this but you have to apply a lot of pressure to bullet. I'm not sure whether I'm straightening the neck or cocking the bullet, but my accuracy always seems better if my set up is lined up with less than .003" of cartridge runout from the start. Before I got the Hornady, I used the RCBS for several years. It's trickier to get a good reading but it will also measure the runout of the unloaded case neck in relation to the case body. The nice thng about this capability is that I can see if the case is OK as opposed to the seating process causing runout. Also, I can check the dye for runout, as well as the rifle chamber by measuring a fired case. I have been able to detect dyes that are not straight. The dyes that are straight will produce accurate loads that are as good as the more expensive bushing competition dyes. If the neck size is right, this is a money saver. In my experience, the biggest culprit to runout seems to be excessive pressure to seat the bullet. I also think that runout could be a major issue with factory ammo. I have tested so called "Premium" ammo that produce run outs as high as .007-009". IMO.
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Old 04-03-2013, 10:29 AM
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Re: Bullet runout?

I am with Greyfox on this too. One thing I did start doing is to start the bullet about 25% in the neck and then turn the case 180 degrees and finish the seating. When I put the cartridge in the concentricity guage they are generally within .003 to .005. Some are a dead on. My time spent messing with the guage has been reduced and I look for .001 or less concentricity.
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  #6  
Old 04-03-2013, 10:42 AM
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Re: Bullet runout?

My 22-243 will shoot about 1 inch groups at 200 yards with about 7 thous of run out. If I use my hornady tool to straighten up the runout to about 1 or 2 thous my groups will open up to about 2 or 3 inches qt 200 yards. Needless to say I dont straighten them anymore.
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  #7  
Old 04-03-2013, 01:18 PM
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Re: Bullet runout?

now that just ruined my day............................Just when you thought you fixed the problem you realize that you in fact made it worse
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