Trimming question? - THR

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Old September 25, 2015, 10:03 AM   #1
Join Date: January 22, 2012
Location: Kansas
Posts: 927
Trimming question?

I recently trimmed a bunch of .204 cases, all of which have e been shot 2-3 times. My manual says the maximum length should be 1.850" and the trim length 1.840". As I was measuring each case, some were 1.850 and some longer so I decided I would just trim the whole batch (500 cases) to 1.840". My question is, since the cases are now slightly shorter, should I change the load? That is, I have a great load worked up, so will the slight change in the case length have a significant impact on accuracy? I suppose a few test shots would be wise, but just wondering what your experience has been??
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Old September 25, 2015, 10:21 AM   #2
The Bushmaster
Join Date: January 29, 2005
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Change your load? No...If it's a good load the trimming will, more then likely, not change a thing.
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Old September 25, 2015, 10:49 AM   #3
Join Date: December 20, 2013
Location: Central FL
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I always seat bullets up against the rifling in my bolt gun anyway so I have never felt the need to make any changes after trimming. FWIW I check case length every time I clean up a batch of 25 and trim each as needed, not necessarily at the same time.
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Old September 25, 2015, 12:39 PM   #4
Join Date: July 27, 2007
Posts: 974
The load pressure depends on the internal volume of the loaded case. Trimming has not changed that, unless you have changed you COL.
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