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September 3, 2008, 02:53 PM | #1 |
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What makes the biggest difference
Whats going to make the biggest difference...
a .2 grain weight variation in the powder or a 6 grain weight variation in the brass?
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September 3, 2008, 03:36 PM | #2 |
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A matter of percentage.
How much does the entire powder charge weigh?
How much does the entire case weigh?
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September 3, 2008, 06:37 PM | #3 |
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when you say "brass" I'm assuming you mean the weight of the case .... but there is no impact on performance from the weight of the case in a reload. I mix and match head stamp brands on cases all the time in my pistol reloads with no impact on performance.
But like other response - you need to clarify what you're talking about / 0.2 grain variation in powder - what caliber, what powder, what is your target load you're trying to get for a powder drop, and what is the minimum and maximum load in the book. If by weight of brass - you mean the bullet ... What bullet, what caliber, what grain bullet. a 6 grain variation in a 230 gr RN bullet is only 3% but its more than I would like. A 6 grain variation in a 124 grain bullet is 5% and that is way too much tolerance. Too much variation in the bullet is an indication of quality control. |
September 4, 2008, 06:40 AM | #4 |
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i mean variation in weight of brass case. when trimmed my federal match brass has, what i think, a pretty broad variation. if the brass is the same length then the heavier weight must be thicker. that would certainly effect pressure.
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September 4, 2008, 07:05 AM | #5 |
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The case weight variation effects case capacity and therefore burning rate of powder.
The .02 gr. variation in powder charge is considerably better than factory standard, where 1/2 gr. variations can occur. Your case variation example would be a 3% (within factory standard) variation and sorting your brass can easily get you into 1.5 gr. tolerence + or - from avg. I'm using an '06 case for an example. In an '06 case, it would take 1/2 gr. variations in powder charge, or more before you could, maybe, see it on paper--- if you were a good shooter-- using an accurate hunting rifle. That's 1/2 gr. variations from average,which means there could be a full gr. difference in the extreme. In a .223, the .2 gr. pwd. charge variation wouldn't be noticed, but the 6 gr. case variation would be too extreme, if even possible. Better to go % of average with 3% being ok, and within 1% a little too strict and unnecessary--- unless you're a benchrest kind of guy. Handloaders don't have to put up with those variations. You can sort/weigh your brass to better than facory standard and load powder charges dead on the money if you weigh your charges. I assume you're talking about rifle loading, but even if loading for pistol with those kind of variations, you wouldn't have match ammo, but you'd be ok for serious practice. |
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