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Posted: 2/5/2013 10:43:40 AM EDT
question for y'all who are obsessed with accuracy 
When weighing and separating your brass, how small a spread are you looking for? Is there a 'magic' percentage that you try to hit? I get it that a standard deviation of zero is unrealistic, I'm just curious as to what y'all do as a standard practice. |
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Quoted:
question for y'all who are obsessed with accuracy
When weighing and separating your brass, how small a spread are you looking for? Is there a 'magic' percentage that you try to hit? I get it that a standard deviation of zero is unrealistic, I'm just curious as to what y'all do as a standard practice. For me, it depends on who makes the brass, how many pieces am I separating, and what gun. At one extreme is Lapua 220 Rus brass which shows very little variation right out of the box. So, I usually sort a box of 100 to give me one group that usually doesn't vary by more than 0.1 grain (usually near the center of the bell-shaped curve). At the other extreme is bulk brass, which I may or may not sort at all. I do sort brass for my HS Precision 223 and my Lee Six 308. Usually I can get a bell-shaped distribution, and the 3-4 groups neaar the center of the distribution may vary by 0.1 to 0.4 grains, depending on with how many brass pieces I start. Eg., I may have a group at 94.1-94.2,another at 94.3-94.4, 95.0 even, 95.1-95.3. The tails on either side of the bell shaped curve usually show a range of 2 or more grains, and can then be for other guns, but each tail is still sorted better by weight than the original bulk. |
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