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Old April 10, 2007, 10:49 PM   #1
Luciano
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How short should I trim my rifle cases?

I'm loading 25-06 Rem wich has a max case length of 2.494 I noticed that some of the new Win cases I bought are pretty short so I trimmed them to 2.478.Is that a bit short and why?Thanks
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Old April 10, 2007, 11:34 PM   #2
hivel37
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Most manuals give a "trim to" measurement. I usually trim to about .006 below maximum. As I understand it, if cases trimmed much below minimum are used, chamber erosion can occur. How many such rounds it would take to cause this, I don't know.
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Old April 10, 2007, 11:40 PM   #3
hivel37
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By the way, if they were already short, why did you trim?
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Old April 10, 2007, 11:43 PM   #4
Unclenick
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I usually trim 0.015" below maximum. This is because randomly sampled cases from new bulk brass can be as much as 0.012" under maximum to begin with. By going to 0.015" under maximum, I am sure to have trimmed them all the same length. I will not have to trim again for at least 3 reloads, letting the necks gradually grow back toward maximum.

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Old April 11, 2007, 11:25 AM   #5
WCW
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I maintain all rifle cases to .006 below maximum length. If I start a new batch of cases I just continue loading them until they require trimming. I have never noticed any appreciable difference in accuracy with slightly shorter cases in my 25-06 Remington Sendero.
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Old April 11, 2007, 02:19 PM   #6
Luciano
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I trimmed them because I wanted an uniform case length.As Unclenick mentioned some new cases are .012 under the the max.Perhaps I'll let them "grow" a bit.
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Old April 11, 2007, 02:53 PM   #7
brselman
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Trim length

Unless I am mistaken and have read the rcbs fl x-sizer die instructions incorrectly, rcbs recommends an initial trim to 0.020" off of the maximum. They claim when using their x die, you should never have to retrim thereafter. Anyone have any experience?
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Old April 11, 2007, 03:42 PM   #8
Ifishsum
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I've had several batches of new Win brass that I had to trim a bit short just to get the necks square. No ill effects that I can see, and I don't have to re-trim as often.

Most loading manuals give a trim-to length of .010 under maximum.
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Old April 11, 2007, 07:42 PM   #9
brickeyee
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You can always measure the chamber and then determine what the correct length is for that gun.
A chamber cast will reveal all sorts of things.
You can also do it with special plugs.
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Old April 11, 2007, 07:57 PM   #10
mrawesome22
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Use the data in your books.
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