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Location: Colorado Springs
Joined: 02/23/2009
Posts: 182
What's the difference

I just bought a new batch of brass and was wondering if I should 'fire form' the brass before using it for current loads or just load 'em up?  What's the difference? Think   My load currently shoots M.O.A., if I don't 'fire form' the new brass, will it effect the accuracy enough to cause concern?  Never bought brand new brass before, that's why I ask. 

Critter's picture
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Grand Slam Challenge Winner!Moderator
Location: Western Colorado
Joined: 03/26/2009
Posts: 4062
All I do with new brass is

All I do with new brass is neak ream them then full length resize, load and fire them.  Accuracy might be off a little if all you do is neck size your fired rounds but not much.  You can skip the neak reaming if you don't have a reamer it is just something that I do. 

It sounds like you got your rounds up to snuff from the last time.   

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Location: Colorado Springs
Joined: 02/23/2009
Posts: 182
Critter, I may have figured

Critter, I may have figured out what went wrong.  It seems some of the bullets were seated out .002" further than the others.  Not sure what happened there, but, I reduced the load, and reloaded a new lot for testing on Friday.  This time, I measured each round to ensure that they were all uniformly seated to the same O.A.L.  As for the original post, that's what I though.  Thanks for the input.

JJD
JJD's picture
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Location: Right Side WA state
Joined: 11/07/2008
Posts: 208
Measurements

AFHunter wrote:

Critter, I may have figured out what went wrong.  It seems some of the bullets were seated out .002" further than the others.  Not sure what happened there, but, I reduced the load, and reloaded a new lot for testing on Friday.  This time, I measured each round to ensure that they were all uniformly seated to the same O.A.L.  As for the original post, that's what I though.  Thanks for the input.

In my years of relaoding, I have found bullet seating depth to be critical and for sure, .002 can make a difference.  I dont use cartridge overall  length (COL) as a measurement.  Bullets packed loosely in a box can have their tips flattened and vary .010+ easily.  While I grant you that the polymer tipped offerings are a bit hardier they can change slightly too.

Either purchase or make a comparator that measures from the bullets Ogive (shoulder).    A very simple tool that fits on to your caliper. 

Midway USA on line has some pretty decent photos.  Midwayusa.com I believe.

The link will let you get a look at some options and give you an idea as to how they work.

Other co may have these cheaper, but these guys had the best photos.

Actually pretty easy to make out of some alloy bar stock and a drill press.

bitmasher's picture
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Location: Colorado
Joined: 02/27/2002
Posts: 2973
Fire forming is really only

Fire forming is really only necessary if your shooting some type of ackley cartridge and using the non-ackley version of the cartridge for brass.  For example shooting 22-250 brass in a 22-250 AI in order to get the correct neck angle.

WesternHunter's picture
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Joined: 05/05/2006
Posts: 2368
It shouldn't

I get new brass every once in a while and as long as it's sized, trimmed, and the powder is consistent and bullet seated to my specs there's not much to have to adjust at the range.  Occasionally I'll find something off with one or two rounds, but that's to be expected, nothing dramatic.  of course my rifles are tuned with full length sized brass, never fire formed.

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