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Neck turning mandrel/scarring inside case mouth

 
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  #1  
Old 03-05-2011, 10:40 PM
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Neck turning mandrel/scarring inside case mouth

I'm wondering if anyone else has had this problem. The mandrel on my neck turning tool is scarring the inside of my neck and the scarring is causing more resistance on my bullet seating which in return is causing my groups to open up. The only way I've found to remedy this is to run it back through the mandrel on my sizer die to kind of smooth it back out. Do yall know of a way I can avoid all this scarring. I've also got plenty of clearance between the mandrel and mouth of my cases so it's not that. It turns with no resistance, but you can tell there is some rough spots inside the neck.

Thanks,
Nathan
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Old 03-06-2011, 05:35 AM
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Re: Neck turning mandrel/scarring inside case mouth

Nathan, did you get one of these Expander die and mandrel

Sinclair Search : Search Results for "expander die" -

SINCLAIR INTERNATIONAL : Sinclair Expander Mandrel - oversized -

Might want to read this
Outside Case Neck Turning for Factory Rifles | The Reloading Press
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Old 03-06-2011, 02:58 PM
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Re: Neck turning mandrel/scarring inside case mouth

I guess I shouldve explained a little better what I've got is a rcbs hand held neck turning tool it works very good but it seems to rough up the inside of the neck. It isn't bad but just enough to cause it to drag when I seat my bullets. The way I've found to smooth up the inside of the neck is to run it back through my sizer die, it's just aggravating to have to go back through all the brass I've turned and do this. I'm gonna try and get some fine sand paper and smooth out the pilot on the neck turner.

Thanks,
Nathan
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Old 03-06-2011, 10:17 PM
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Re: Neck turning mandrel/scarring inside case mouth

I have the same problem with the Forster turner



I use a strip of Scotchbrite to scour the inside of the neck and smooth it out while spinning in a Zip Trim







then a little mica and it helps smooth out bullet seating and release



A little work but you only have to do it once.
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Old 03-06-2011, 10:32 PM
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Re: Neck turning mandrel/scarring inside case mouth

I would try more lube, turning necks requires a lot of lube, you can't over do it, use the lube.
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Old 03-06-2011, 10:38 PM
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Re: Neck turning mandrel/scarring inside case mouth

Quote:
Quote:
Originally Posted by woods View Post
I have the same problem with the Forster turner



I use a strip of Scotchbrite to scour the inside of the neck and smooth it out while spinning in a Zip Trim







then a little mica and it helps smooth out bullet seating and release



A little work but you only have to do it once.
Woods.. you da man! I love your pictures
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  #7  
Old 03-07-2011, 02:06 AM
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Re: Neck turning mandrel/scarring inside case mouth

Just an observation... its not really necessary to 'quote' the entire post with all the pics just to reply to it, is it?

Otherwise... +1 on lube. That looks like galling more than anything. Assuming that pilot on the neck turner isn't too rough, the inside of the neck should *NOT* come out looking like that! The K&M turner I use has polished/hardened pilots and mandrels, but they still get some brass buildup over time and I need to a) remove that stuff before it starts increasing the diameter of the mandrel or the pilot, thereby screwing up my neck thicknesses, and b) make sure it doesn't start causing undue friction/heating which can again mess up the resulting neck thicknesses. More lube is the first step, and keeping the turner and its pilot clean and cool is the next.
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