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Joined: Jul 2012
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Sidelock
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Sidelock
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Joined: Jul 2012
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Baz Smiles,
When I need to thin rims( 6,5x58R, 5.6x35R Vierling, .310 cadet, etc), I just chuck them in the lathe, with the rim bumping the chuck jaws( any type or even collet will work) and face them off from the rear. When I find the amount of reduction required, I set a carriage stop to make then all the same. I also set a cross feed stop to center the tool ( turned parallel to the "ways" to adjust initial depth by micrometer dial on cross slide) on the primer pocket and make the cut "out". So I move the tailstock out of the way, chuck the case, bump the cross slide against the stop, bump the carriage against the stop and lock it, make the cut, deepen the primer pocket with a Lyman primer pocket uniformer, radius the sharp outside corner of the rim with a file ( move the case out a little first to keep the file away from the chuck). Repeat the operations until all cases are done then chamfer all primer pockets by hand, doing it by under power can result in taking too much. On the first one, you can section the case to make sure it is not thinned too much. That is a long sentence, but when you are doing the work it doesn't take much time.
Mike

Joined: Aug 2021
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Boxlock
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Boxlock

Joined: Aug 2021
Posts: 15
Mike
Thank you for the reply, you may think it lengthy but to me it's usefully detailed and I appreciate the time and thought you have put into it.
I haven't touched a lathe for years so would struggle here; with these details though I know a man who could/can.
Cheers


Let he who casts the first stone - be accurate.
If he cannot be accurate, he should practice first.
Joined: Dec 2020
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Sidelock
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Sidelock

Joined: Dec 2020
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British cases for the .500 already have very thin rims to the extent that you have to be very careful not to tear them off with the shell holder when extracting from the die even with prober lubrication.

It may be worth getting someone to make you a 360 degree shell holder ( female threaded collar to drop around case and screws on to male threaded shell holder base).

Slower buts saves cases.

You probably will not have to thin the rims

Last edited by Parabola; 09/17/21 03:39 AM. Reason: Typo
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Sidelock
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Baz Smiles,
You are welcome. If you encounter the problem described by Parabola, I suggest you de-prime by hand and size the cases with the de-priming assy. removed. Then if the case" sticks" a little, you can tap it out with a dowel or if really bad with a punch and heavier hammer. Parabola's idea is interesting, just be sure the new shell holder is installed before sizing the case.
Mike

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