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918v
03-27-2008, 11:54 PM
So I weighed a trayfull of CCI-500 primers today. Each primer weighed exactly 3.3 grains. I'm not going to weight-sort this component.

I then weighed my prepped 9mm brass and found a +/- .6 grain variance. The heaviest case weighed 54.7 grains. The lightest case weighed 53.5 grains. The spread was pretty even, although the lightest of the cases was a full .4 grains lighter than the next lightest case. I think that case will cause fliers. I'll mark it to see if it does.

I think it is interesting that there is still so much variance in case weight, even after full prep work.
BigSlick
03-28-2008, 12:02 AM
Interesting.

.4 light on one case.

And some people can't understand why we reload.
Tree Rat
03-28-2008, 08:35 AM
What dimension did you settle on for case trim length?


TR
New
03-28-2008, 09:13 AM
Did you weigh them before, or after you trimmed the cases?? :skep:
918v
03-28-2008, 09:34 AM
Did you weigh them before, or after you trimmed the cases?? :skep:

They weighed roughly +/- 1 grain before trimming.
918v
03-28-2008, 09:36 AM
What dimension did you settle on for case trim length?


TR

.747"

That way all the case mouths are cleaned-up completely.
layusn1
03-28-2008, 09:44 AM
What about cleaning out the primer pockets and uniforming the flash holes? Uniforming the primer pockets? I would think that would cause some weight variations. They might be minor but it might tighten up the weight variations. Whaddya think?
Steve Koski
03-28-2008, 09:57 AM
You can't trim that short. They won't headspace properly and you'll kB! for sure.
918v
03-28-2008, 10:02 AM
I did all that: Trimmed the cases to .747", deburred the flash holes, and uniformed the primer pockets. I have power tools with carbide cutters so it went very quickly. I think the lighttest case is a defective one, although it has survived five firings and one trip through a P7.
WalterGA
03-28-2008, 10:03 AM
Couldn't stop myself!:wink5:

http://i107.photobucket.com/albums/m294/Walteridus/SolomonJuice.jpg
MullahElRon
03-28-2008, 10:12 AM
Very refreshing indeed!
918v
03-28-2008, 10:20 AM
You can't trim that short. They won't headspace properly and you'll kB! for sure.

So what is the minimum trim length?

Some of my R-P cases arrived at .739" from the factory.
Steve Koski
03-28-2008, 10:25 AM
I was just jerking your chain. Trim them to nothing, they'll still fire.
918v
03-28-2008, 11:08 AM
I know ;)

But R-P 9mm sucks ass.
MakeMineaP99
03-28-2008, 12:31 PM
What about Starline?
918v
03-28-2008, 10:59 PM
Starline is like Winchester.
BigSlick
03-28-2008, 11:18 PM
IMO, in 9x19, best is FC

Then IMI

Then old school PMC or Starline or Win
Tree Rat
03-29-2008, 09:22 PM
.747"

That way all the case mouths are cleaned-up completely.

You gotta debur after the trim?


TR
918v
03-29-2008, 10:17 PM
Just a wee bit, not enough flash to worry about though.