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Reloading Techniques For Reloading


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Bullet runout?

 
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  #8  
Old 04-03-2013, 06:38 PM
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Join Date: Jan 2007
Location: PA
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Re: Bullet runout?

One way to improve TIR is to use an expander before you size. (Not the expander ball in some dies.) Sinclair and K&M sell them. Then size with a good bushing die. The shell holder must be correct also.

Straight neck is critical. As for straightening them out with a tool afterwards, I have heard that it can be done, but the next loading will again not be concentric and the same process must be repeated. Your seater die can be to blame also. The tip of the bullet can touch the seating dome inside the die, and skewer the bullet to the side.

The very best bet is to use Wilson dies with an Arbor press and you should have no problems.
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  #9  
Old 04-04-2013, 11:47 AM
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Re: Bullet runout?

I'm convinced that minimal bullet runout is best attained by full length sizing fired bottleneck cases in dies without expander balls but with necks about2 thousandths smaller than a loaded round's neck diameter. Don't set the fired case shoulder back more than 2 thousandths. This centers the sized case neck best on the sized case shoulder and causes minimal neck bending from bullet forces on the unsupported case neck when seating bullets. With cases so sized, most any bullet seater will end up with bullet runout less than 3 thousandths which is good enough for no worse than 3" groups at 600 yards with good bullets, powder charges in great barrels.

This is for the .308 Win case or any bottleneck case headspacing on its shoulcer; runout should not be more than 1% of bullet diameter.

If your runout tool does not use the case shoulder at about mid point on it for the front reference, then bullet runout sill be effected by the out of round condition of the case body or the case neck's center offset from the shoulder's center reference. It's the case shoulder that centers the cartridge in the chamber shoulder when the round's fired; the case neck free floats in the chamber neck and touches nothing unless it's off center on the case shoulder.
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  #10  
Old 04-07-2013, 11:23 PM
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Re: Bullet runout?

The best we can do is make STRAIGHT ammo.
Staight ammo is also concentric.
But concentric ammo, by this attribute alone, is not always straight.

And as learned by the former neck-bender earlier, making ammo concentric could be the very worst thing we should be doing.

To make straight ammo:
1. Cull by thickness variance
2. Fireform cases
3. Minimally size the cases
4. Minimal mandrel neck expansion
5. Inline seating of bullets (Wilson)
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