300 blk brass question

[Gurry78]

I formed about 250 300 blk brass by running it through a Hornady die with the decapping rod and neck expander removed, then chopping it off at the shoulder, then trimming. The case lengths were good but the inside of the case mouths were measuring as small as .280. I decided to run them back through the Hornady die with the neck expander installed and that fixed the inside neck size but now most of my case lengths have changed. The range is from 1.358 on up to 1.372. SAAMI calls for 1.368 +/- .002 and my average case is now around 1.360.....are the cases junk now? Can I subsonic plink with them? or what can I do with them to fix it? Thanks!

 

[country888]

Re: 300 blk brass question

Their fine, just trim the one's that are to long to length and shoot them!

 

[Matonoca73111]

Re: 300 blk brass question

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Gurry78</div><div class="ubbcode-body">SAAMI calls for 1.368 +/- .002</div></div>

SAAMI calls for 1.368 -.020, which is 1.348 to 1.368

Link to SAAMI publication
http://www.saami.org/pubresources/cc_drawings/Rifle/300%20AAC%20Blackout.pdf

 

[leadbullet]

Re: 300 blk brass question

I cut all my cases to 1.360 and they shoot just fine, consistency is more important than SAAMI length.