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Old January 22, 2013, 04:56 PM   #1
Reich
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Case dimention question

I just bought RCBS die set for .222 rem. After trimming and sending the case through the decap size die all dimentions are perfect except neck diameter. All the Materal I read so far says it should be .253, but I keep ending up with .245. Not only is it a pain to seat the bullets,but I am worried about pressure problems. Am I good to run with these cases?

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Old January 22, 2013, 05:42 PM   #2
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The drawing is here. Notice that under the name of the cartridge it says:

"UNLESS OTHERWISE NOTED
BODY DIA -.008 (0.20)"

Where it gives the neck as 0.253, there is no tolerance noted. That means that, even though the drawing says 0.253", that's only the maximum, and the -0.008" tolerance means it can be as small as 0.245". Note also that this is the number with the bullet in place and not before you've seated the bullet, which will be smaller.

To make seating easier, be sure to have adequate chamfer on the case or get a Lyman M die for your chambering. It puts a small step in the mouth that lets you seat the bullets upright and start in straight.
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Old January 22, 2013, 08:41 PM   #3
Reich
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Thanks

Thanks for your help
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Old January 23, 2013, 07:51 AM   #4
oneoldsap
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Trim after sizing , not before !
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Old January 23, 2013, 04:23 PM   #5
FrankenMauser
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Quote:
Trim after sizing , not before !
Some trimmers use pilots that are sized for fired cases. Sized cases won't fit on the pilot. So, you don't have much choice in the matter, with those trimmers.
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Old January 24, 2013, 12:01 PM   #6
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If you only have the ability to trim before resizing (though buying a different pilot would fix that), then you want to apply your calipers to see how much resizing grows these cases and trim that much further extra short before resizing. This amount will vary with individual chambers, so you have to measure it for the particular gun and brass. Brass from a loose chamber will grow more during resizing than one fired in a tight chamber, all else being equal.
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