#1
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Neck Turning Limits/brass thickness
With the pressures involved, just how THIN can a neck actually go before it becomes merely decoration?
On paper the 22lr and .223 are rather close.... what happens if someone turned down the .223 neck to the same thickness as the 22lr? OR in the most extreme sense of neck turning, if someone gave you a piece of cartridge brass tubing, a 1mm thick wall thickness, how thin could you take it? |
#2
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#3
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I would turn it only enough to clean it up, or
Where I have proper clearance for chambering. Otherwise you're wasting time turning necks
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#4
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Can't answer your' question but have one of my own: Why take it to the limit?
I can only think of two goals to achieve through trimming neck thickness. 1. Proper chamber clearance with a loaded round, as Mike said. 2. Uniformity of neck thickness in the hopes of maximizing accuracy. Once I am happy with those two things, I stop. |
#5
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Quote:
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#6
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I neck turn on all of the brass for my 223 and formed 20 TAC. I usually turn about .002 or just enough to clean up the brass.Then I trim for length and weigh each one of them. Those that are within 1 grain, are used in batches. Anything over or under are put into a different batch and marked as such.
I actually get better accuracy than I need by doing the above. Then I anneal. The neck turning helps guarantee, after being annealed,that the neck tension should be equal for most turned/annealed necks. Lots of work, but mostly, this only needs to be done once in a while. Last edited by Lenard; 03-23-2018 at 03:18 PM. |
#7
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For my pet project of a CF 22, I have realized that it may need to be a "lathe turned cartridge" and I am really trying to figure out the limitations in terms of turning down a cartridge neck.
I know folks have made ersatz cartriges for obsolete rounds by turning down brass on a lathe, but normally for cartridges with a bullet diameter of .4 and larger. I know .22 and smaller cases get neck turned a lot, but I just don't know the "sweet spot" before the case neck becomes a really expensive second brass jacket for the bullet. |
#8
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There are only two reasons that I am aware of for turning necks. First off, they can be turned to avoid different diameters on the neck. Secondly, turning can be necessary when the chamber neck is too tight to expand properly when fired, thus avoiding pressure spikes.
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