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I have been working on making 556/223 brass into 300 blackout .
I don't have a jig to cut the brass so I have been running it thru the full length resizer with the pin removed then going back and trimming the neck's off with a RCBS trim pro I have rigged on a drill press. I'm sure this is not the best way to do it but it works. I am leaving all the brass long around 1.40 and should have a Lee case length gauge soon.
 

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I would say roughly less than 5/16 of a inch . The 556/223 brass measures 1.775 roughly after running thru resizing die and I use a #22 pilot on the trimmer to cut the neck's off at 1.417 rough so .358 . I had a good used .300 blackout case with correct length when I set up the trimmer in the drill press and just adjusted the trimmer up to leave me room for error . I will be using a Lee case trimmer to finish trimming the brass to the correct length .
 
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