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GregK

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PostSubject: Found this to be very interesting   December 15th 2013, 7:32 am




[size=-2]Belted Bullets & Crush Rib Sabot with Boron Nitride Coating.[/size]

Hexagonal boron nitride (HBN) is a ceramic that has all of the advantages of graphite as a lubricant with none of the disadvantages. HBN is able to withstand temperatures up to 3,300-degrees F under normal atmospheric conditions before sublimation. It will not conduct electricity, become magnetic, or hold any sand or metallic particles. It would be really nice if we could fabricate rifle barrels out of this material with its extreme hardness under compression, but unfortunately it has a weak tensile strength. Any monolithic barrel fabricated from ceramic will shatter like glass from internal or tensile pressure. However, when applied as a coating to the bore of conventional steel barrels, we can obtain all of the benefits of ceramics without the disadvantages.

Because of its high thermal conductivity, HBN is commonly used as a releasing agent in molding processes involving molten metals and slags. It is also combined in container material for molten metals, non-lead glass and metal oxides. HBN coatings have proven to be excellent in braze stop-off, as well as being beneficial for weld spatter release.

A semi-retired engineer from Los Alamos National Lab, Noel Calkins, determined that HBN, when properly applied, will function as a lubricant and outperform all other lubricants (wet or dry), including graphite and molybdenum di-sulfide. There is no liquid to run out or dry out when applied to rifle barrels or bullets. It reduces wear and increases the muzzle velocity by friction reduction. Sound like a pie-in-the-sky? Well, it isn't!

From a crystallography standpoint, HBN is a hexagonal material that is platelet-like in structure, like graphite. However, it maintains its lubricating properties under greater temperatures, even in a vacuum. For these reasons, it has been referred to as the "white graphite."

When HBN, as a dry fine particulate ceramic consisting of 0.5 to 14 micron sized particles, is burnished into a metal's surface, it produces the lubrication effect of a dry lubricant. With this in mind, Noel developed a patented process whereby he could apply HBN to a bullet and gun barrel. When the bullet is fired, the particles are small enough that they literally embed themselves into the barrel's bore grain boundaries. Testing at a national laboratory confirmed that the HBN does, in fact, penetrate into the pores of the steel and produce a long-lasting lubricating effect. How long, no one really knows for sure, due to the many variables. Independent testing with an AR-15 indicates no significant reduction in the ceramic coating after 4,500 rounds.

It requires 15 to 20 rounds of coated bullets to achieve the desired level of ceramic coating in a barrel's bore. After the coated rounds are fired, higher muzzle velocities are achieved, averaging 2% - 5% in center fire rifles, indicating a better seal and/or less friction. In either case, the barrel stays cleaner, as with less friction, there is less tendency for powder residue or bullet metal to remain in the barrel. The two patents involved in this technology have been confirmed by Los Alamos National Laboratory and belong to Mr. Calkins. One of these was shared by Mr. Calkins with Northrop Aviation, as applied to their B-2 bomber, which is no longer in production.

We became interested in using HBN to determine whether it would be useful for muzzleloader hunters by reducing or eliminating the need to swab between shots. With that in mind, we coated 15 belted bullets with the ceramic and headed to the range. After firing the HBN treated bullets through Jim's CVA Optima V2, we began our tests.

We used the following black powder substitutes: Triple7 pellets, White Hots pellets, Black MZ powder, Triple7 powder and Blackhorn 209 powder. We shot various combinations using 260 grain Harvester Scorpion PT Gold bullets with Crush Rib Sabots, 270 grain Harvester Saber Tooth belted bullets and the 250 grain CVA Aerolite belted bullets. The only way to describe the results are: WOW!

Everyone knows that if you shoot Blackhorn 209 swabbing is unnecessary. However, if you are among the muzzleloaders who use the other black powder subs, you have to swab between shots. (Maybe not on the second shot, if you have an "open bore," but certainly every shot thereafter.) With the ceramic treated barrel, we fired twenty rounds without swabbing, using the previously mentioned propellants. While the ceramic did not completely prevent the common buildup of crud in front of the breech plug, it was substantially reduced, making it easy to properly seat the bullets.

Since not everyone shoots belted bullets, we coated 20 of Harvester's Crush Rib Sabots with HBN and fired them with Scorpion PT Gold bullets through Mary's CVA Accura V2 rifle. Once again, after firing the treated sabot/bullet combinations, we were able to shoot all of the above propellants without swabbing. Whether you shoot belted or saboted bullets, the HBN ceramic is easy to apply.

For muzzleloaders, the benefits to having a ceramic treated bore are:


  • No swabbing between shots while hunting.
  • The cleanup after shooting was much easier. The small bit of crud remaining in the barrel was removed easily with a single pass of a brass brush followed by two or three patches. It was almost too easy. Of course, cleaning the breech plugs required the same tedious effort because 209 primers are dirty little sparkplugs.
  • Corrosion and rust resistant - a major plus for muzzleloaders.
  • Overall, an increase in muzzle velocity, similar to that obtained by the National Laboratories in center fire rifles. However, we are not posting our numbers, as there were significant variances in the muzzle velocities for the powders we tested. One powder did not result in any increase in muzzle velocity, while the others produced increases ranging from 5% to 15%. As such, each ML shooter will have to determine the velocity for their own powder/bullet combination.
  • Our reasoning for not going into details on muzzle velocity is that the primary benefits of HBN for muzzleloaders is no swabbing between shots and easy cleanup. We don't want to muddy the water, so to speak, by dwelling on the issue of velocity.


If you believe that an HBN treatment of your muzzleloader barrel would be of value, you can contact Mark Chavez in New Mexico at mark@gunhawkfirearms.com or go to the GunHawk Firearms website (www.gunhawkfirearms.com). They can provide you with additional information on HBN.

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drummy

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PostSubject: Re: Found this to be very interesting   December 15th 2013, 7:54 am

Hey Greg
I couldn't open the link

Edit: Got it sorry

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ericcosh



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PostSubject: Re: Found this to be very interesting   December 15th 2013, 8:13 am

Sounds pretty gimmicky to me.
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rsrocket1



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PostSubject: Re: Found this to be very interesting   December 15th 2013, 8:53 am


This isn't HBN, it's salt bath nitriding.

Nitriding is done on metals pretty regularly.

I don't know how much better it is compared to chrome lining barrels, but it does look interesting.
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PostSubject: Re: Found this to be very interesting   December 15th 2013, 8:54 am

study 
Good Greg.
Very interesting to say the least  scratch Could this be the next best thing and MR. Chavez will be living on easy street  Question  Question  Question 

Ray................ Shooter

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PostSubject: Re: Found this to be very interesting   December 15th 2013, 9:03 am

Sounds more useful for those who don't use BH 209.

I wonder how it does with BP and a PRB?

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PostSubject: Re: Found this to be very interesting   December 15th 2013, 11:25 am

This certainly opens some possibilities!

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PostSubject: Re: Found this to be very interesting   December 15th 2013, 11:59 am

I'd like to see how it performs with PRB and full bore lead bullets as well.
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MLN1963



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PostSubject: Re: Found this to be very interesting   December 15th 2013, 12:45 pm

Interesting.

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PostSubject: Re: Found this to be very interesting   December 15th 2013, 1:17 pm

very very interesting. My brother ordered some dynatek bore coat for some guns and that has ceramic particles in it.
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GregK

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PostSubject: Re: Found this to be very interesting   December 15th 2013, 3:11 pm

My Mountaineer has a factory Dyna Tek bore coating & it does clean with a lot fewer patches than any other smoke pole I own.

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LEUPOLD 4-12X40 VX-R 30mm, CDS, FIRE DOT
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LUEPOLD 4-12X50 VX-R CDS, FIRE DOT, WIND PLEX

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Spitfire



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PostSubject: Re: Found this to be very interesting   December 15th 2013, 10:35 pm

I think anything that will fills the microscopic pores in the barrel steel and stays put will help a lot with clean-up as the fouling has less place to hang onto.
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MLN1963



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PostSubject: Re: Found this to be very interesting   December 15th 2013, 10:42 pm

Greg, where did you get this info from?

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Mark

I have more muzzleloaders than centerfires! How did that happen?

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CVA Optima V1 rifle with WP BH209 breech plug
CVA Optima V2 pistol with WP BH209 breech plug
CVA Electra No breech plug, it has a spark plug
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PostSubject: Re: Found this to be very interesting   December 15th 2013, 10:54 pm

It's on the net , think ole Randy put it up.
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GregK

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PostSubject: Re: Found this to be very interesting   December 16th 2013, 6:11 am

@Spitfire wrote:
It's on the net , think ole Randy put it up.

It's an article that was posted by Dr. Clarey & it was indeed on the Chuck Hawks page. I'm not a fan of Chuck or Randy, but this wasn't directly from them so I have no issue sharing it

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LEUPOLD 4-12X40 VX-R 30mm, CDS, FIRE DOT
CEB 40/240, 76gr IMR 4895
2600 ft/s

CVA APEX .358 SML & .45 ML
LUEPOLD 4-12X50 VX-R CDS, FIRE DOT, WIND PLEX

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PostSubject: Re: Found this to be very interesting   December 16th 2013, 8:23 am

I didn't see a date on the Clary article, but HBN coating is nothing new, even with firearms.  HBN  seems to be a custom application for use on firearms, but apparently has yet to prove itself cost-effective to gun manufacturers where the "law-of-diminishing-returns" applies to your weekend casual shooter.

Although it may be a tedious task to apply yourself, a Dyna Tek bore coating (Poly methyl-silazane: i.e., contains Silicon) may be a more practical alternative for hunters looking for a little extra protection.
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GregK

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PostSubject: Re: Found this to be very interesting   December 16th 2013, 2:27 pm

@Marty wrote:
I didn't see a date on the Clary article, but HBN coating is nothing new, even with firearms.  HBN  seems to be a custom application for use on firearms, but apparently has yet to prove itself cost-effective to gun manufacturers where the "law-of-diminishing-returns" applies to your weekend casual shooter.

Although it may be a tedious task to apply yourself, a Dyna Tek bore coating (Poly methyl-silazane: i.e., contains Silicon) may be a more practical alternative for hunters looking for a little extra protection.



It was from Nov 2013

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I hunt with the best

McRem 40cal SML

LEUPOLD 4-12X40 VX-R 30mm, CDS, FIRE DOT
CEB 40/240, 76gr IMR 4895
2600 ft/s

CVA APEX .358 SML & .45 ML
LUEPOLD 4-12X50 VX-R CDS, FIRE DOT, WIND PLEX

Knight Mountainer LTD
45cal / 1-20 twist
LEUPOLD 4-12X50 VX-R 30mm WIND PLEX CDS FIREDOT
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PostSubject: Re: Found this to be very interesting   December 17th 2013, 11:30 am

Just like the molybdenum craze, I'll wait until all the cards are played before making my bet.  Suspect 

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PostSubject: Re: Found this to be very interesting   December 26th 2013, 12:27 pm

I could maybe see if it was applied at the barrel factory but firing bullets? That sounds like the next latest and greatest snake oil pitch.
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