Re: WTB: hBN (hexa)Boron Nitride
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: penumbra</div><div class="ubbcode-body">thanks guys for the info. i will check the sources you mentioned; however, a few questions come to mind:
1. IIRC hBN is applied using a tumbler, what media would i use along the hBN? lead shot? ceramic pellets? copper shot?
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Many ways I've read to do it. I place in a plastic jar just big enough to hold 100 bullets, half as many BB size shot with as much hbn as can load on the tip of a screwdriver blade. Place the jar in tumber with any media and go for 15 to 30 min. Some go longer for hours and some less for about 10-15 min.
Some report different size shot gives better coverage. IIRC someone used #6 shot. Some whip off any excess white coating of hbn. I don't just leave it on and will help coat the inside of your barrel which takes anywhere from 50 to 100 bullets. Hbn works very well with high heat one of it's industrial usage is protecting tools in high heat applications.
Before using hbn clean your barrel down to the metal then after the 50-100 bullets conditioning only clean it when accuracy starts to degrade. In my 308 that is after 600 or more rounds.[color:#000099]</span>
2. since hBN is hygroscopic,
2.a. once applied to the bullets it will absorb water and expand, right?
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Don't know a way to measure that and find out if it's true once it has been pressure applied, beat into the surface, of a bullet[color:#000099]</span>
2.b. should i apply to as large a batch as possible?
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My opinion is doesn't matter. I have 4 or 5 boxes hbn treated ammo loaded last summer that has been sitting around and it shoots just the same.
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2.c. should i seal the bullets after application?
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I'd store the same way as untreated reloaded ammo.
The big deal is how was the hbn stored before you got it. How do you store it once you get it.
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2.d. should i seal the loaded ammo?
3. what quantity would i need for say 1000 bullets (338LM 300gr)?
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3 to 6 grains per 100 so 1k would be about 30 to 60 grains. I use about 10-15 grains per 100 myself.
hope this helps
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