Boron Nitride

[6BRonwheels]

Hello Everyone;
I did some basic testing with Boron Nitride the past couple of days. I am impressed with this stuff! I had been using Danzac in my Savage 308 the past year. Compared to the Danzac, BN makes the barrel easier to clean, noticeably less barrel heat when shooting groups, and reduces pressure/velocity better than Danzac. I shot two five-shot groups over my F1 Chrony and came up with a 16 fps extreme spread and a 4.7 standard deviation. My velocity has dropped 55 fps compared to Danzac loads, so I need to re-tune my loads.
I applied the BN the same as I do the Danzac, tumbling with shot.
Good Shooting,
Jack

 

[danang]

Go to MikeB@21stCenturyBallistic Solution.com they have hBN and an application process. They sell in less than 1 lb packages also.

 

[brian427cobra]

Question, do I need to heat the bullets up when applying hBn?

 

[anyrange]

My Peanut Butter Jar Process Works

 

[zfk55]

I know that this is an old thread, but I read a few things here I know to be incorrect. Rather than answer it myself, I'll copy two excerpts from the patent.
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Edge, read this section of the patent.

'This is achieved by the ceramic dry lubricant providing reduced friction and improved bullet seal, reducing vibration or 'chatter' of a bullet traveling down the gun barrel. Another advantage is the elimination of gun barrel corrosion. Corrosion or rust can only begin in metal grain boundaries, which, according to the present invention, are filled with the sub-micron sized particles of the ceramic dry lubricant. Anotheradvantage is increased accuracy. This results because the bullet time-to-target is reduced as a result of increased muzzle velocity. Accuracy is increased also due to the reduced stress caused by reduction of friction and heat. Accuracy is also increased as a result of a more consistent bullet seal achieved by the present invention. A final advantage is the inexpensive nature of the present invention, which can be practiced in the field on existing gun barrels.'

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We're still running dwell time and hBN amounts. We're at the point of changing the procedure to '1/4 of the P-Nut butter jar being the impact coated .177 BBs, 100 175gr projectiles and three,not two) grains of hBN.

I have a confimation enquiry sent to one of the the process originators and should have an answer shorty.
Patience.


And this is the difficult part we're still working on.

'Secondary Ion Mass Spectrometry,SIMS) testing performed on the surfaces of the internal bore of gun barrels shows that the boron nitride powder used in accordance with the present invention results in the ceramic powder particulates beingclearly embedded within the grain boundaries of the metal gun barrel. These test results show that burnishing sub-micron particulate ceramic is effective, and that continued firing of uncoated bullets will continue to experience the advantages of thepresent invention for an extended period of time. Such testing also shows that excessively coating boron nitride powder onto bullets provides erratic results and sometimes no velocity improvement. Thinner coating on the bullets provides more consistentvelocity improvement.'


But the question is..... How thin?


And in case you didn't see this one.........

EXAMPLE NO. 1

A 0.308 caliber firearm was loaded with a series of boron nitride powder-coated rounds as well as a series of uncoated rounds. The velocity of the rounds exiting the barrel of the firearm as well as the temperature of the firearm barrel weremeasured in feet per second by a chronograph and in degrees Fahrenheit, respectively, to determine velocity and temperature effects of metal oxide powder implantation by burnishing the internal bore of the barrel with a suitable dry lubricating ceramicparticulate. See FIG. 7 for specific results.

Summary of results

20 uncoated rounds had an average muzzle velocity of 2368 feet per second and a maximum barrel temperature of 120° Fahrenheit. A first set of 20 boron nitride powder-coated rounds had an average muzzle velocity of 2732 feet per secondand a maximum barrel temperature of 138° Fahrenheit. A second set of 20 boron nitride powder-coated rounds had an average muzzle velocity of 2719 feet per second and a maximum barrel temperature of 150° Fahrenheit. The average gain inmuzzle velocity by coating rounds with boron nitride powder was 157 feet per second. The average gain in barrel temperature was 18° Fahrenheit.

Note

The temperature increase was likely caused as a result of the particulate being burnished into the internal bore, representing the thermal work being bestowed upon the barrel. The likelihood is that barrel temperature will be reduced as theinternal bore is further treated with particulate
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Does anyone here actually have percentages of BBs, 100 175gr SMK projectiles and the proper amount of hBN added?
Despite all of the users posting on different boards, I have yet to see any real, solid specifics.
Any info appreciated.
Thanks!

zfk55

 

[jo191145]

zfk55

I'm far from a scientist.
I have used Moly WS2 and now exclusively HBN.
In my expierience HBN is by far the easiest coating to apply consistently. I use no media,BB's) Just dump the pills in the bowl and vibrate. Always used media for moly and WS2. I also do not wash the pills first. Something I found crucial to do with moly and WS2 for consistent results.

As for how much HBN? Seeing as how large a lb of HBN is I see no reason to get stingy I use about a 1/4 teaspoon for 300 6mm pills.

 

[zfk55]

Thanks for the reply!
This excerpt is one I found after using 1/3rd of the jar full of BBs, 100 175gr SMKs and 8gr of hBN. The groups immediately opened up and we were surprised.
I went back to the original patent and found this........

'These test results show that burnishing sub-micron particulate ceramic is effective, and that continued firing of uncoated bullets will continue to experience the advantages of thepresent invention for an extended period of time. Such testing also shows that excessively coating boron nitride powder onto bullets provides erratic results and sometimes no velocity improvement. Thinner coating on the bullets provides more consistent velocity improvement'

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The very first day out we produced one ragged hole, 5 round groups being a nominal .565'. Apparently I went too far with reading, digesting and messing with the first formula combo,which I've forgotten) and now we're back to moa, and the rifle has proven itself capable of better.

I think I'm going to try at least one small control group donw as you suggest and find out.
Thanks again

zfk55

 

[Webster]

BN is vey hard and it should be abrasive. Gun barrels are very soft compared to BN????

 

[CPorter]

Cubic boron nitride is very hard, like diamonds. For bullet lube though we are using hexagonal boron nitride that is more like graphite.