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CRBS Case Master now what?

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CRBS Case Master now what?

Postby Grimstod » Wed Nov 19, 2014 6:54 pm

I thought I wold share some post I had made elsewhere. Maybe get things going here again.

So now that I have a way to see just how horribly unconcentric my ammo that I have been loading is, what do I do to make it concentric?

I use Berger 185gr VLD Hunting bullets for most of my loading with my Forester seating and sizing dies. My brass I neck size with .001th of neck tensions using their Bushing type S neck sizing die.

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Re: CRBS Case Master now what?

Postby Grimstod » Wed Nov 19, 2014 6:55 pm

I have been doing a little more reloading and started to do something that an article on the bulletin suggested. I seat half way then turn the bullet 180 then seat it the rest of the way. I have seen a slight improvement.
However one interesting revelation was when I started moving the rest that you rotate the bullet on, up and down the shell. With the rest on the shoulder I get the 12-15thousanths of runout. But when I put the rest on the neck I only get like .003 What does this mean?
This is all Virgin brass. I have only neck sized it with a redding Type S Bushing necks sizing die. I seat my bullet with a Forster micrometer die.
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Re: CRBS Case Master now what?

Postby Grimstod » Wed Nov 19, 2014 6:57 pm

I can only copy past my responses here so to see the conversation here is the link

http://forum.accurateshooter.com/index. ... =3856508.0
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Re: CRBS Case Master now what?

Postby kcwomack » Wed Nov 19, 2014 8:39 pm

Grimstod wrote:I have been doing a little more reloading and started to do something that an article on the bulletin suggested. I seat half way then turn the bullet 180 then seat it the rest of the way. I have seen a slight improvement.
However one interesting revelation was when I started moving the rest that you rotate the bullet on, up and down the shell. With the rest on the shoulder I get the 12-15thousanths of runout. But when I put the rest on the neck I only get like .003 What does this mean?
This is all Virgin brass. I have only neck sized it with a redding Type S Bushing necks sizing die. I seat my bullet with a Forster micrometer die.


More than likely the shoulder of the brass is out of round, probably due to abuse in shipping. 8-)
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Re: CRBS Case Master now what?

Postby ShootnMathews » Thu Nov 20, 2014 1:49 pm

I always FL size new brass before loading it. Brass gets beat all kind of ways while going thru the factory and shipping. I would be curious to see if you check the concentricity, knock the bullet out, FL size it, then load it back and see if the concentricity of both the bullet and neck improved or got worse.

Jared

On a somewhat related side note. I do believe NS will drastically save brass life. And on a custom match grade chamber is probably more accurate. However on average over the counter rifles I really can find no difference in accuracy between FL and NS brass. I ate the NS is the only way to get great accuracy burger from the benchrest sites for a while but on pretty much all of my factory guns, once the load is tuned in, i see no difference on paper out to 750 yards. Most of my hunting guns I will FL size because the brass cycles better and with the same accuracy I'd trade cycling for brass life.
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Re: CRBS Case Master now what?

Postby Shepard » Tue Jan 20, 2015 2:22 am

I to FL size fresh brass. If there is something out of spec this will bring it back. You can go 2-3 firings before it needs full sized -- neck sizing in between. You have watched me shoot -- I load the round one at a time. I don't like my brass sliding over one another. Loading one at a time lets you feel if there is an anomaly in the case that requires attention. If the cases were not rimmed I would be more inclined to use the magazine.
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Re: CRBS Case Master now what?

Postby Grimstod » Wed Jan 21, 2015 6:32 pm

Actually can confirm that factory virgin brass is pretty beat up. Before I FL size they are about 13-15ths out, and after they are usually only 2-3 with the bullet in them. Thats using all Forster dies.
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Re: CRBS Case Master now what?

Postby kcwomack » Wed Jan 21, 2015 9:16 pm

Grimstod wrote:Actually can confirm that factory virgin brass is pretty beat up. Before I FL size they are about 13-15ths out, and after they are usually only 2-3 with the bullet in them. Thats using all Forster dies.

What, like you doubted me? :lol:
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