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Bullets - Variation w/in a box of 100

 
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  #1  
Old 08-26-2012, 03:41 PM
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Join Date: Jun 2009
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Bullets - Variation w/in a box of 100

It's too dang hot to do anything outdoors today so I decided to see what kind of weight variation I had in a new box of 130 grn bullets. I was a bit surprised with what I found:

129.5 gr 1
129.6 gr 2
129.7 gr 1
129.8 gr 10
129.9 gr 21
130.0 gr 24
130.1 gr 19
130.2 gr 17
130.3 gr 5

Total 100

I guess what surprised me is I expected to see a little taller bell shaped curve and one that wasn't shifted to the high side.

Is this pretty normal? What do you do with the outliers +/- .2 grs?
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Old 08-26-2012, 08:17 PM
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Location: Allen, TX
Posts: 2,608
Re: Bullets - Variation w/in a box of 100

not too surprising

weight is less of an issue than bearing surface and meplat uniformity provided that the bullets are well balanced

I've seen up to .8 grain extreme spread from a box of 500 142 SMKs which I sorted and grouped by bearing surface length

and, it was a pretty tight bell curve around the mean as I recall

-- richard
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Old 08-27-2012, 02:09 PM
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Re: Bullets - Variation w/in a box of 100

Testing for accuracy, I've shot 30 caliber Sierra 155's with 8/10ths grain spread in weight into sub 1/2 MOA at 800 yards. And 30 caliber 190's and 200's into sub 1/2 MOA at 1000; they also had 8/10ths grain spread in weight. Not one of all these bullets had a nose job nore were sorted by bearing length. But they did have up to 3/1000ths runout stuck in case mouths.
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Old 08-27-2012, 02:50 PM
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Join Date: Apr 2012
Location: The cold part of Montana
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Re: Bullets - Variation w/in a box of 100

Get a box of Amax! I gave up and lumped em together by 0.2gr, still ended up with 5 batches. Bergers are waaaaaaaaaaaay better about consistency
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Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

Joe
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  #5  
Old 08-27-2012, 05:48 PM
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Re: Bullets - Variation w/in a box of 100

Quote:
Originally Posted by scoutm View Post
+/- .2 grs?
That's +/- .001 G1BC, .0005 G7BC

I'm an ***** about my bullet dimensions, & even I don't bother to weigh them!
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