How to reduce COAL variation?

[IGOTGLOCKED]

I reloaded a pan full of 9 to work on during the SB. Again I can attest to even range pick ups same type head stamps make a big difference in oal variance! Saturday I ran all the brass I had primed but not now loaded (maybe 150) which were of various head stamps. I saw an average extreme variance of .006 - .009. The ones I loaded yesterday were all Blazer ( I tried Winchester last time) and again saw an extreme variance of 95%+ of them to be only .002-.003. And again 100% of them gauged in the chamber of my barrel, I don't use a case gauge any more...

 

Cheers!

[IGOTGLOCKED]

You know I have been on a mission to reduce my OAL variance. Of recent I have began hand sorting (9mm) by head stamp and was quite pleased with the results this weekend. The best brass so far seems to be Speer. A great majority of the batch was as good as an OAL variance of +/- .001 - .002! I was getting +/- .003 - .004 with Blazer. Yes, on a 650... It's kind of a pain hand sorting head stamps however the results speak for themselves!

 

Cheers!

 

 

Edited February 20, 2017 by IGOTGLOCKED

[MemphisMechanic]

What is the difference in accuracy you find with your hand-sorted ammo?

 

Are chrono velocities or group sizes more consistent?

 

I'd honestly be surprised if they are, but I have an open mind about it.

[IGOTGLOCKED]

Don't know yet Memphis. I had to reserve the LE Bay @ my lgs to do the chrono work and couldn't get the bay until next Tuesday.  Closest outdoor range is 1.5 hrs away...