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Do you trim your cases before or after resizing?


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#1 OFFLINE   kargo27

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Posted Sep. 02 2009 - 04:53 PM

Logic would say after resizing but what do I know! :laugh:


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#2 OFFLINE   Sticks

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Posted Sep. 02 2009 - 07:52 PM

After :wink:


#3 OFFLINE   glock10mmman

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Posted Sep. 02 2009 - 07:58 PM

After. After your resize the case, the excess brass has to go somewhere and the somewhere is up making the neck longer.


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#4 OFFLINE   GLShooter

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Posted Sep. 03 2009 - 03:05 PM

Logic would say after resizing but what do I know! :laugh:


You have to trim after the resizing. The brass flows as they are sized from being squeezed back down and the expander button can work the brass back and make the case longer.

Greg


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#5 OFFLINE   Elmer Fudd

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Posted Sep. 09 2009 - 08:19 AM

BEFORE !

if you own/use a press like the Dillon XL 650 or the Dillon Super 1050

AFTER !

if using a single stage press


#6 OFFLINE   GLShooter

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Posted Sep. 09 2009 - 11:49 AM

BEFORE !

if you own/use a press like the Dillon XL 650 or the Dillon Super 1050

AFTER !

if using a single stage press


Given that is your process do you find variation in case length if you trim before the sizing? The trimming is not every time and it is an interruption to the flow. That is why I believe in having lots of brass and shoot it in rotation so that I can trim it all at once and not have to deal with variation from batch to batch.

Greg


#7 OFFLINE   TomJefferson

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Posted Sep. 09 2009 - 12:13 PM

I do both on .223.

I use a little statistical control and project finished neck length. This allows me on plinker type rounds to trim before resizing with a quality plan in place to insure I don't get too much length. Basically my guns are 5.56mm so can take a 1.772" case length. I trim to 1.750" so its not going to grow that much after resizing. This actually works pretty darn well with my cannelure bullets being right on height and within the band of the cannelure.

When crimping a round case length has far less impact on accuracy than when not. The cannalure and where the case lip is after bullet seating is an excellent quality visual check. It not only lets you know you are dead nuts on or not but lets you judge the population variance. I get one over the groove, I segregate then decide to pull and rework or let it ride after a fast measurement.

Precision rounds, I trim after sizing. These I'm doing a secondary operation ID sizing the neck and it kind of defeats doing that if I have length variation.

There's always different ways to skin a cat. The main thing is we hold that max tolerance for safety sake.

Tj





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