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Loaded ammo bullet runout???

 
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  #50  
Old 06-24-2012, 10:46 AM
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Re: Loaded ammo bullet runout???

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Originally Posted by blkdog View Post
I just purchased the Hornady concentricity tool. It has a dial indicator and is adjustable to indicate where you want. You can also correct run out with a threaded thumbscrew. It works like it is supposed to. One other tip to avoid run out is to turn your loaded round 180 degrees and run it back through the die. I don't know why this works, but it does. Most of the time my run out is less than .002 and after running them through the Hornady tool you can get it down to "0". I hope this helps.
When you disturb the neck and bullet relationship to get it to center, you also bring into light a new set of problems. Your a lot better off starting out with a strait case prior to seating a bullet in the long run. I never index a case in my press. If I see .0035" TIR, I start to look around for a problem before ever seating a bullet.

By the way if that dial indicator is an analog one, your looking at 10% backlash in it or more (the Chinese ones often get in the 15% area). The digital ones work off a linear encoder, and are usually good for .0003"-.0006" (there is no provision to take out the backlash electrically on this type of indicator)
gary
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  #51  
Old 06-24-2012, 01:31 PM
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Re: Loaded ammo bullet runout???

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Originally Posted by Bart B View Post
My measurements show no difference within 2/10,000ths inch until body diameters start getting close to chamber diameter. Full length sized cases had overall better centering than neck sized ones.
But none of us have any idea what measures would occur on actual firing.

With FL/excess sizing, you're creating the very problems that you try to rationalize away as good attributes.
I think that if you make ammo that is actually straight, there is no need for band aids(like extra clearances) to get a gun shooting well. No need for fish tales.
And I think guns that shoot well enough with band aids, might do even better without.

It's not difficult to make straight ammo, and coincidently, to get a tight chamber fit(which creates straighter ammo) shooting well.
IMO, it's far easier all around -for well designed LR hunting cartridges.
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  #52  
Old 06-24-2012, 02:17 PM
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Re: Loaded ammo bullet runout???

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Originally Posted by blkdog View Post
One other tip to avoid run out is to turn your loaded round 180 degrees and run it back through the die. I don't know why this works, but it does.
This usually happens with conventional seating dies when its bullet seating stem is off center in the bullet guide. There's enough clearance on some seating dies to wrap one layer of transparant tape around the seater head so there's zero clearance between it and the die body.

I've done a lot of measuring on cases to see how well their necks are aligned with their body using a bullet runout tool. Bullets tend to align themselves with the case neck axis when they're seated. If the case neck's not straight on the case, no bullet seater will make them seat straight. Crooked case necks will bend a bit in seaters with tight neck areas as the bullet's seated but will spring back to a bit crooked after the round comes out of the seating die.
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  #53  
Old 06-25-2012, 09:51 AM
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Re: Loaded ammo bullet runout???

Well for those of you that don't know Speedy and I know each other and if you want you can PM me and I will inform you what he said about this thread via an email lol. It was not complementary on the theory of not having a aboslute concentric relationship between the ammunition and the chamber.
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  #54  
Old 06-25-2012, 10:03 AM
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Re: Loaded ammo bullet runout???

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Originally Posted by Boss Hoss View Post
Well for those of you that don't know Speedy and I know each other and if you want you can PM me and I will inform you what he said about this thread via an email lol. It was not complementary on the theory of not having a aboslute concentric relationship between the ammunition and the chamber.
Why not put what he said in this thread so we all can get his opinion?

If it's a secret only to be revealed to special folks, why even mention it publically when a PM to those who might be interested might be in order?

This "secret stuff" has prevailed in the BR crowd for years. Those not considered worthy by BR folks of such information are never told what's going on in the BR world. Speedy's comments seem to be one of these secrets just like what's the biggest groups their "tack drivers" shoot are.
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  #55  
Old 06-25-2012, 10:08 AM
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Re: Loaded ammo bullet runout???

All it takes is a simple PM. If you don't care to know then fine. It is only one word so you don't get your expectations up for a detail response which in this case would not be appropriate.. Speedy is pretty blunt when speaking to me because that is the way we have always communicated--no fluff.
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  #56  
Old 06-25-2012, 10:59 AM
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Re: Loaded ammo bullet runout???

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Originally Posted by Boss Hoss View Post
All it takes is a simple PM. If you don't care to know then fine. It is only one word so you don't get your expectations up for a detail response which in this case would not be appropriate.. Speedy is pretty blunt when speaking to me because that is the way we have always communicated--no fluff.
Thanks for this information. So an emotional outburst of one word is better than several to insure understanding. I could respond in kind, but that would not be welcomed by its recipients.

I've got Speedy's street and email addresses and his phone number, I'll contact him and get better informed.
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