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bow shot · March 23, 2010, 12:03 PM

How close to my target trim length do I need to keep, really?

What generated this question is this: I have high quality (Nosler) brass, and much of it was below the spec. trim-to length before the first firing. Now, after firing, the range of the case lengths has increased to 0.010" (with a few outliers that would actully make the spread 0.020").

This brass is very uniform in neck wall thickness and TIR. but as you can see, the trim length is all over the map. Or would a good, bug-shooter say, "Dude, 0.010" tolerance is fine and will have no effect on accuracy."?

This is .204 Ruger, case length specs are: 1.850 max 1.840 trim-to and 1.830 min. I'm expereincing 1.830 - 1.840 (with a few in the 1.825-1.8.0" range)

March 23, 2010, 12:03 PM	#1
bow shot Senior Member Join Date: March 26, 2009 Posts: 263	Request advice on trim tolerance How close to my target trim length do I need to keep, really? What generated this question is this: I have high quality (Nosler) brass, and much of it was below the spec. trim-to length before the first firing. Now, after firing, the range of the case lengths has increased to 0.010" (with a few outliers that would actully make the spread 0.020"). This brass is very uniform in neck wall thickness and TIR. but as you can see, the trim length is all over the map. Or would a good, bug-shooter say, "Dude, 0.010" tolerance is fine and will have no effect on accuracy."? This is .204 Ruger, case length specs are: 1.850 max 1.840 trim-to and 1.830 min. I'm expereincing 1.830 - 1.840 (with a few in the 1.825-1.8.0" range)