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Post by ed alger on Jan 4, 2015 0:08:48 GMT -5
What might be the expected weight deviation from a box of factory 168 grain .308 bullets?
I opened a fresh box of Nosler CC, 250 ct, 168 grain .308 bullets. I weighed each bullet and segregated them by weight.
weight gr %
167.8 16.1
167.9 44.3
168.0 33.6
168.1 06.0
Would this be a typical weight range? Would this weight range have effect on accuracy (all other elements considered equal)?
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bob
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I'm too old to be nice but never too old to learn!
Posts: 1,457 
Location: Northern California
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Post by bob on Jan 4, 2015 1:19:12 GMT -5
Ed, I'm not sure but I doubt that about 0.2% total difference from heaviest ot lightest will have much effect. However where the weight difference is,front or back, may but once again I would doubt it. I also think those weight differences would be within manufacturing tolerance.
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gws
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Posts: 969
Location: NW New Mexico
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Post by gws on Jan 4, 2015 20:18:47 GMT -5
Yeah, I wouldn't know. Sounds like a good question for our resident benchrester! Dan?  |
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Post by krwada on Jan 5, 2015 15:44:32 GMT -5
That weight distribution is actually pretty good for premium factory made projectiles.
I have measured the weight distribution of the M80 ball, and have found as much a s+/- 8 grains in this stuff, (147 grain FMJ)
Also; I have measured the weight distribution of the .308 168 grain Military FMJ match projectiles, and have found variances of up to + / - 2 grains, (a little bit better).
The Sierra Matchking projectiles usually have a weight distribution within a couple of tenths of a grain. This is similar to what you have found with the Nosler stuff.
Unless you have a benchrest gun; I would not sweat a few tenths in the projectile. The uniformity of the base, and the CG uniformity probably will have bigger effects on performance than the bullet weight with most sporter rifle configurations.
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dangun
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I love the smell of burnt gun powder.
Posts: 517
Location: SW Florida
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Post by dangun on Jan 21, 2015 23:38:58 GMT -5
Hi guys, sorry I'm late for this party. The 167.8 and 167.9 and the 168.0 and the 168.1 or the 167.9 and the 168.0 can be shot together. Max deviation in bullet weight is +/- .1gr for optimum accuracy. Another thing that most people don't check on factory bullets is roundness. When I sort custom or my own bullets, any that aren't round get culled. I hope that helps.
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Post by wychild on Jan 22, 2015 16:03:44 GMT -5
I select my match bullets +- 0.1 gr, not to change the subject, but I think the ogive to base measurement when selecting bullets has more effect as it changes the volume of the case when seating the bullet I agree with what, Dan stated, bullet roundness (concentricity) which has an effect on the bullet stability in flight.
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poohzilla
Member
Give me a place to stand and a long-enough lever, and I will invariably break the lever.
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Post by poohzilla on Jan 22, 2015 16:06:56 GMT -5
Hi Wy ! Been a while.
Dan and Wy present good points. Probably because of my cast bullet interest, I look at bases. Not as much of a factor with factory stuff, but once in a while... (I guess it's sort of like women. Although I'm no longer in the market, I still look for signs of a ring. It's safer that way.)
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Post by wychild on Jan 22, 2015 16:39:12 GMT -5
Ya Poo I have been busy as a one legged man in an a$$ kicking contest.(:>}
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bob
Member
I'm too old to be nice but never too old to learn!
Posts: 1,457
Location: Northern California
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Post by bob on Jan 22, 2015 20:53:01 GMT -5
Wychild: Good to see your voice!! I've heard that expression before but I've never seen it.
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My daughter came from Missouri, my son and grand son, my wife and I had a nice dinner of grilled "porter house" pork chops, corn on the cobb, my son, G'son and I share 10/5. G'son is 4 minutes early though @ 10/4.
Pooh I hope you find to right house . 
