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Old 02-10-2017, 06:25 PM
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Case weights


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I am prepping a new batch of brass for my Swift.
I weighed them and separated them into 4 separate grain weight groups.
The extreme spread of these cases were 170 to 173 gr.
What is your tolerance for grouping brass? does + or - 2 grain effect accuracy much? Or do you keep separated by ea. grain weight?
Thanks
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Old 02-10-2017, 06:47 PM
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I don't separate at all. I know that sounds silly for a varmint hunter, but I don't feel the need. For some it's part of the game (no offence)

Three grains in a 220 Swift case (IMO) isn't much. In a .222 case it might be a lot, I don't know.

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Old 02-11-2017, 06:27 AM
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Same boat, don't separate anything.
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Old 02-11-2017, 06:33 AM
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Easiest way to tell how much difference there is is to fill them with water. Weigh each empty and full and you know how much they hold. That'll help you understand how much difference there is. Or, you can make some assumptions and calculations based on the weight of brass. Personally, I find filling with water (use some soap to reduce surface tension, to prevent getting a bubble stuck in the case) almost as fast and more reliable.
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Old 02-11-2017, 07:06 AM
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I separate by weight; I believe it makes a difference, if only a small one. For target rifles, where a tenth of an inch of improvement is meaningful to me, I'm happy to go the extra mile.

I know for most folks reloading is all about producing a pile of ammo to shoot. Call me crazy, but I very much enjoy the process of reloading, and by that, I mean case preparation. Seating a primer, charging a case with powder, and then seating a bullet to a specific length are what I consider the icing on the reloading cake. The real substance of reloading is in preparing the cases to meet your needs or goals. Maybe this is a result of all the time I've spent turning one brass cartridge into another, for various wildcat rounds. I've turned 30/30 into 30 Herrett and 7-30 Waters, 225 into 6.5JDJ, 445 Super Mag into 358GNR, and most recently, 303 British into 35 INDY. Maybe I enjoy case prep because of working with those rounds, or maybe I work with wildcats because I actually like spending time prepping brass?

What I do when I sort brass by weight is to find the most common weight, then include all brass that is within 1 grain of that weight in my pool of cases. I should mention that I do any necessary trimming before sorting. For the less expensive brands of brass, this usually results in as much as 25% of the cases being set aside.

For hunting ammunition, I am nowhere near this picky.
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Old 02-11-2017, 07:12 AM
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This is off the top of my head, but in my experience, given that all cases are from the same manufacturing lot, a 2% variation in case weight equates to roughly 0.5% variation in capacity. That's generally inconsequential.

Follow MZ5's advice and see for yourself how much capacity variation you have, then test, on target, your separated batches versus a mixed lot.

I do weight and volume tests on 30-06 and 308 for a couple match rifles. Their case weights and volumes are pretty close to what you are seeing in the 220 Swift and my matched batches of 100 cases are target weight, say 185 grains, +/- 2 grains, so, from that aspect, your total lot of cases is already within my standard for a "matched" lot of cases.
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Old 02-14-2017, 07:00 AM
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I weigh everything I use all lapua brass and I shoot nothing but competition my calibers below, also anneal regularly, my 6mmbr case have 25 reloads on them
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Old 02-14-2017, 07:52 AM
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Sorting brass: I sort cases by head stamps, and dates, Years ago I started loading on a RL 550B, I loaded 250 30/06 cases with different head stamps. But first! I weighed all of the cases and found 16 grains difference between the heavies and lightest. I used the same bullet, same powder charge. When finished I weighted the loaded rounds and sorted by the heavies and lightest. I then sorted the cases by head stamps and found the 16 grains differences between the heaviest and lightest could not be attributed to too much powder.

So, yes I weight cases but for a different reason. For me there is nothing entertaining about pulling the trigger with no clue as to what is going to happen next.

F. Guffey

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Old 02-14-2017, 02:32 PM
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I have three guns accurate enough to tell the difference between case weights. The difference is almost .050!!! I don't weigh cases any more because groundsquirrels dont measure.
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Old 02-14-2017, 03:02 PM
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Separate Brass

Separate Brass: It makes sense to me to separate brass by brand or make. Been doing this for decades keeping it simple.

Weighing: In an ordinary rifle will weighing really make that much difference? Don't fiddle with weighing? My feelings are that we get to the point of diminishing returns pretty quick with standard chambers. I am not speaking of target rifles,
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Old 02-14-2017, 04:39 PM
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3/10 gr. After prep.
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Old 02-15-2017, 05:07 AM
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Quote:
My feelings are that we get to the point of diminishing returns pretty quick with standard chambers.
I see that a lot; 'diminishing return'; and then there is rendered scrap, again, there is nothing entertaining about chambering a round, pulling the trigger and having no clue what is going to happen next. And then there is the saddest words of verse or pen (at the gun range), "it must have been a double charge".

One day a friend took a new build to the range, he got set up, chambered a round, pulled the trigger and then collected his wits, counted his fingers and then walked toward the target to recover his barrel. Before he rendered his new build scrap he became too automatic. He became a multi task-er.
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Old 02-15-2017, 07:22 AM
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Quote:
Originally Posted by JBelk View Post
I have three guns accurate enough to tell the difference between case weights. The difference is almost .050!!! I don't weigh cases any more because groundsquirrels dont measure.
Good point on the ground squirrels , in my case I have won a match by an amount I'm not sure you could measure, just breaking the 10 ring so every .050 counts
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