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weighing brass

 
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  #1  
Old 08-10-2009, 09:42 AM
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weighing brass

I was hoping for some help here, having never weighed brass before I took 50 rounds of once fired .284 brass from a new gun I had built that was trimmed, cleaned and ready to load. the brass is winchester brass all from the same bag. with the 50 rounds I came up with 3 different piles when done the brass varied in weight by 6 grains. this don't hardly seem possible to me but I have double checked on a second scale. Is this normal quality? and how much variance in weight should I allow? I am weighing on a ohaus 1110 scale so it is possible to be very exact. I do not think in this bag there would be 10 cases that would be exactly the same. NOW after finishing and sorting this is what I have out of the 49 cases I deemed good in the bag, 21 weigh 204.9 plus or minus one tenth, 9 weigh 206, 7 weigh 198.5, 6 weigh 200, 5 weigh 202.8 and 1 weighs 200 even.
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Last edited by Bud Martin; 08-10-2009 at 10:07 AM. Reason: count
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  #2  
Old 08-10-2009, 11:33 AM
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Re: weighing brass

This is an opportunity for you to find a reasonable interpretation.
Catalog and fireform the spread, then MEASURE their H20 capacity.
With that, you'll learn the significance of your brass weight variance.

Your capacity may follow.
Or, follows inconsistantly
Or, It might not correlate at all.

It's your brass
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  #3  
Old 08-10-2009, 11:48 AM
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Re: weighing brass

Your gun may not know the difference between them.

And what MikeCr says is right...there may not actually be a case capacity diff.

If it were me and I wanted to use this weighing as a segregator I would make two batches with the 204-206 wt brass and the lighters ones as a complete other batch.

Someday go to the range and see if they go to diff points of impact....I'll bet you don't see any diff.
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  #4  
Old 08-10-2009, 01:44 PM
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Re: weighing brass

What I do, is to keep them segregated and work up a load with the center of the weight. Then I'll load some of the heaviest and lightest and see if it shoots in the same spot with the same velocity. If it does, I ignore it. If it doesn't, then I keep them segregated and use them as seperate lots.

I try to use Norma, as the weight spread of 100 brass is more typically 1-2 grains (might have 2-3 that are out of that group though).

AJ
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Old 08-10-2009, 02:05 PM
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Re: weighing brass

I prefer to work up max loads with the heaviest cases on the assumption that they will have the smallest internal volume (not always true but close enough). Once the max charge is found with them there should be no surprises with the rest.

Few factory rifles will notice a case weight variation of 3% or so. Not a lot of customs will either.
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"If some is good and more is better, then too much is just right."

AJ, I don't think we're suppose to discuss sex on this board.
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Old 08-10-2009, 02:10 PM
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Re: weighing brass

Quote:
Originally Posted by boomtube View Post
I prefer to work up max loads with the heaviest cases on the assumption that they will have the smallest internal volume (not always true but close enough). Once the max charge is found with them there should be no surprises with the rest.
+1 on this.


Quote:
Originally Posted by boomtube View Post
Few factory rifles will notice a case weight variation of 3% or so. Not a lot of customs will either.
------------------------------------------------

"If some is good and more is better, then too much is just right."

AJ, I don't think we're suppose to discuss sex on this board.

HAHA, I wasn't talking about Sex, I was talking about food , or velocity, or money, or ...

AJ
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If some is good and more is better, then too much is just right.


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  #7  
Old 08-11-2009, 12:14 PM
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Re: weighing brass

"I wasn't talking about Sex, I was talking about food , or velocity, or money, or ..."

Oops! My bad. But ... it sure sounded like .... oh, well. ?? I've never had to much of anything. Have fun tho!
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