weighing bullets...

[IdahoSharpshooter]

Spring is here, at least I hope so.

I am finally getting to work on the 300 Win Mag. I have several hundred Sierra 190gr .308 caliber MKs.

What level do you sort bullets to by weight?

1/2grain...?

thanks,

Rich

 

[dmoran]

My suggestion for weight only segregation: qualifying them as equal as your scale allows, placing them in an order from lightest to heaviest. Then shoot/use them in that same order.
Donovan

 

[Richard Coody]

i just pull out the real oddballs. of course i have only sorted bergers. once you start weighing them the range to sort them into will become apparent.

then i sort by bearing length and do the same

 

[mikeeg02]

My suggestion for weight only segregation: qualifying them as equal as your scale allows, placing them in an order from lightest to heaviest. Then shoot/use them in that same order.
Donovan

Like Donovan said above, my scale measures to .02 grains, so I sort them to .02 grains.

 

[ZenArchery]

i just pull out the real oddballs. of course i have only sorted bergers. once you start weighing them the range to sort them into will become apparent.

then i sort by bearing length and do the same

This...

 

[retired]

sierra's std (use to be) plus or minus .3

 

[ClassCat]

Do you really think that 1/10 of 1% OF OVERALL WEIGHT will make a difference ?

I understand you are attempting to remove ALL varialables.

 

[M-61]

I am more concerned with base to ogive of the bullet than weight. Some wild spreads between lots.

 

[ClassCat]

Hi Jim;
A Good friend and fellow shooter tests All Berger bullets in a private tunnel using a Rail gun.Straight out of the Box as long as Quality is good produce same hole accuracy @100 Yards even with 1/2 -1 grain weight variations.You can pick out the POISON PILLS with a Sonic testing machine that sends a current into the bullet to check for voids or irregularities in the core and copper when the core is seated. We find 2 or 3 per thousand tested.

 

[JFrank]

Hi Jim;
A Good friend and fellow shooter tests All Berger bullets in a private tunnel using a Rail gun.Straight out of the Box as long as Quality is good produce same hole accuracy @100 Yards even with 1/2 -1 grain weight variations.You can pick out the POISON PILLS with an Sonic testing machine that sends a current into the bullet to check for voids or irregularities in the core and copper when the core is seated. We find 2 or 3 per thousand tested.

I heard about some kind of sonic test from a rifle smith. Like to see it in action some time, maybe a video.
SPJ

 

[dogdude]

I heard about some kind of sonic test from a rifle smith. Like to see it in action some time, maybe a video.
SPJ

It was probably the JUENKE machine.

 

[ClassCat]

It was probably the JUENKE machine.

Focused oscillating magnetic field sensor using EDI current measurements

An X-RAY of the bullet in short.

It's not a Juenke

 

[IdahoSharpshooter]

!

I did 300 of them today. I was surprised to find that 243 weighed 190 on the nose.

Sierra was close on their +/-.3gr tolerances. One was 189.7, a dozen were 189.8, and six at 189.9.

the overs, were about evenly spread at 190.1 thru 1.904gr.

 

[ClassCat]

Here is a photo of the Focused oscillating magnetic field sensor using EDI current measurements. The unit operates by probing the bullet with a a focused oscillating magnetic field. This rapidly changing magnetic field induces small circulating currents which flow within the conductive materials in the bullet. The circulating currents create their own magnetic field which is picked up by the sensor and converted into a digital signal. Distance from the bullet to the sensor, material properties, electrical conductivity, are part of the analysis as well as geometry of the bullet, thickness, internal And external uniformity of the jacket, uniformity of the interface between jacket and core as well as temperature of the sample are part of the equation.

 

[JFrank]

Here is a photo of the Focused oscillating magnetic field sensor using EDI current measurements. The unit operates by probing the bullet with a a focused oscillating magnetic field. This rapidly changing magnetic field induces small circulating currents which flow within the conductive materials in the bullet. The circulating currents create their own magnetic field which is picked up by the sensor and converted into a digital signal. Distance from the bullet to the sensor, material properties, electrical conductivity, are part of the analysis as well as geometry of the bullet, thickness, internal And external uniformity of the jacket, uniformity of the interface between jacket and core as well as temperature of the sample are part of the equation.View attachment 1042354

That's amazing, I'll send you a box of bullets right away '
SPJ

 

[Medic505]

Here is a photo of the Focused oscillating magnetic field sensor using EDI current measurements. The unit operates by probing the bullet with a a focused oscillating magnetic field. This rapidly changing magnetic field induces small circulating currents which flow within the conductive materials in the bullet. The circulating currents create their own magnetic field which is picked up by the sensor and converted into a digital signal. Distance from the bullet to the sensor, material properties, electrical conductivity, are part of the analysis as well as geometry of the bullet, thickness, internal And external uniformity of the jacket, uniformity of the interface between jacket and core as well as temperature of the sample are part of the equation.View attachment 1042354

Gotta be some top secret stuff. It is contained in a camo box.....

 

[DRNewcomb]

I would be interested to know if you see any noticeable differences down range, stay in touch.
SPJ

I did a quick Gedankenexperiment with my ballistics calculator, increasing the weight of the bullet by 0.1 gn steps. As long as the MV remains constant, I could increase the weight of a 30 cal bullet by 0.4 gn with no effect at 600 yards. I'm not equipped to predict what impact a 0.1 gn increase in bullet weight has on MV. So, the analysis is perhaps of limited value.

 

[DRNewcomb]

......An X-RAY of the bullet in short......

Well, except it doesn't use X-Rays. More like a tiny metal detector.

 

[fguffey]

And it is like the other shooter said about balancing the bullet when it spins. At one time I thought I could balance anything that spun and then someone shows up with a tester that cost thousands and thousands of dollars, but he could not spin a bullet without shooting it and I had no interest in spinning bullets.

F. Guffey

 

[ClassCat]

And it is like the other shooter said about balancing the bullet when it spins. At one time I thought I could balance anything that spun and then someone shows up with a tester that cost thousands and thousands of dollars, but he could not spin a bullet without shooting it and I had no interest in spinning bullets.

F. Guffey

The unit does spin the bullet. Look to the right, there is a small motor which drives the arm, that spins the bullet in the cradle while the information is collected.