Acceptable variations in trim length - case length

[montana_native]

What would be considered allowable case length variation? I have some 6.5x47 Lapua brass that has been fired 5 times. All cases are between 1.8425" and 1.8450". As much as I despise trimming, would it be worth while to trim based on 0.0025" variation?

Thank you.

 

[dkhunt14]

What would be considered allowable case length variation? I have some 6.5x47 Lapua brass that has been fired 5 times. All cases are between 1.8425" and 1.8450". As much as I despise trimming, would it be worth while to trim based on 0.0025" variation?

Thank you.

I try to keep them within .005 because I feel at distance it shows up. Why are they so different? Usually mine stay fairly close. You must have the wrong trimmer. I don't mind trimming at all. The biggest thing is to not get them too long for the chamber. If it pinches bullets the pressures can get dangerous. Matt

 

[chkunz]

I trim mine each time I load, (not so much for accuracy since I have never seen anyone present data that says what the effect on accuracy is, if any) just to make sure there is nothing unexpected going on with the case.

 

[fguffey]

All cases are between 1.8425" and 1.8450".

In the perfect world you would have .005” clearance if your chamber length was 1.850”.


F. Guffey

 

[Chappy]

I manage to keep mine to within +\-0.0005 with a Wilson hand trimmer.

 

[Bayou]

Not sure about other manuals, but, in a general sense, the Hornady manual gives a number for case length as well as a number for trim to length for rifle cases, at least. A case length falling within those parameters is acceptable. This may not be a preferred approach for someone seeking to trim to a designated length each time, however.

Bayou

 

[langenc]

Not sure about other manuals, but, in a general sense, the Hornady manual gives a number for case length as well as a number for trim to length for rifle cases, at least. A case length falling within those parameters is acceptable. This may not be a preferred approach for someone seeking to trim to a designated length each time, however.

Bayou

Pretty much standard numbers.

 

[savagedasher]

The close you keep the trim length the less problem you will have with the carbon ring .
Larry

 

[gilmillan1]

I never trim my 284 nor my 300 wsm. it doesnt make any difference in accuracy. neck tension is a different animal.

 

[Trevor60]

Here is a video from Jack Neary for brass prep trim length starts at 9:30

all the best
Trevor