After a 10 year wait.............. Its coming!

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15 years 3 months ago #2013 by zfk55
Replied by zfk55 on topic Re:After a 10 year wait.............. Its coming!
Yep. For my Son's 22-250 we've coated Sierra Blitzking, Berger Varmint Match and V Max. No damage at all.
We're switching impact coating methodology. Now its 4 smaller plastic jars evenly spaced around the Lyman case vibrator. Faster and more even.

zfk55

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15 years 3 months ago #2031 by Edge
Replied by Edge on topic Re:After a 10 year wait.............. Its coming!
Well, I got some hBN in. Where do you recommend that I start.

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15 years 3 months ago #2035 by zfk55
Replied by zfk55 on topic Re:After a 10 year wait.............. Its coming!
I'll respond tomorrow before noon with a full explanation. We just completed the learning curve and it cost a couple hundred projectiles, a lot of time and some frustrating targets, but its going to save you a lot of time. We're back to a ragged hole after a few errors in understanding the coating process. Looks like we're exactly where we want to be now.

Pierre

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15 years 3 months ago - 15 years 3 months ago #2037 by zfk55
Replied by zfk55 on topic Re:After a 10 year wait.............. Its coming!
Working in the reloading room this am getting ready for trigger time once the temps are above 55.
To get started, buy one of the 1,000 packs of steel BBs. Get 4 plastic, screw top jars about 4" x 2.5".
WASH the BBs in hot soapy water, rinse with cold water, dry well on a terry towel. Put BBs in each jar to the approximate 1/4 full mark. Add 1.5 grains of hBN and place all 4 in your Walnut Media (or whatever) filled Vibrator Tumbler spaced evenly apart and vibrate for one hour. This pre-coats the BBs.
Back later.

zfk55
Last edit: 15 years 3 months ago by zfk55.
The following user(s) said Thank You: jtallen83

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15 years 3 months ago #2038 by Edge
Replied by Edge on topic Re:After a 10 year wait.............. Its coming!
Are the zinc coated steel BB's ok? That's all I could find. Everything else is copper.

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15 years 3 months ago #2039 by zfk55
Replied by zfk55 on topic Re:After a 10 year wait.............. Its coming!
Yep. Those are the ones.

I'll type up the process in a bit. Wind yesterday and rain/wind this morning. Nutz

zfk55

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15 years 3 months ago - 15 years 3 months ago #2040 by zfk55
Replied by zfk55 on topic Re:After a 10 year wait.............. Its coming!
Make very sure you wash the BBs in hot, soapy water and rinse with cold water. Same for your projectiles.

We've made a few errors, but they've also been resolved. Of the two ways to impact coat we prefer the peanut butter jar in the Thumler's Tumbler. Using the smaller of the two jar sizes, fill it 1/4 full with the BBs. Add 2 grains of hBN and tumble it for an hour. This link is where we began, but we didn't follow the directions specifically. Ours works better for us. This also shows the use of smaller pill bottles, but they're also for smaller projectiles. We clean the coated projectiles by rolling them back and forth in a large Terry cloth towel.
www.6mmbr.com/bulletcoating.html
After the BBs were coated, we added 100 175gr Sierra MKs and another 2.5gr of hBN. This amount was tumbled for two hours. The results were exactly what we expected with the first group, but then...... I made a judgement error.

I continued reading and searching the net for anything we had missed and read a few posts by frequent users that indicated I was using far too little hBN. I changed the formula and proceeded to waste a lot of time and projectiles. After a lot of frustrating 1" and 1"+ groups I went back to the original patent page and found a small poaragraph I had either overlooked or forgotten in all of the very dry reading.

This is the page.... www.patentstorm.us/patents/7197986/description.html

And this is the all important paragraph:
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 consistent velocity improvement

Now I have a nominal 900 projectiles to re-clean in a sonic vibrator with denatured alcohol. Its going to be a long Sunday.

Those that tell you "One inch ? Big deal. I do better than that with my .308 bolt action."
Yeah, but remind them that we're talking semi-auto, not bolt action, and we've gotten .64moa with our best 5 round groups thus far.

I'll answer whatever I can for you, just ask. For the moment I'm headed for the reloading room to continue cleaning over hBN'd projectiles. Sheesh..........

zfk55
Last edit: 15 years 3 months ago by zfk55.
The following user(s) said Thank You: jtallen83

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15 years 3 months ago #2041 by Edge
Replied by Edge on topic Re:After a 10 year wait.............. Its coming!
I'm sorry that this has been frustrating for you. Thanks for posting all your results though! I read about this process a few months ago and you're the first one that has really expanded on it, so I really appreciate you taking the time to post on your experiences with the process.

I'm still on the fence as to whether or not to try this. I'd really like to try this on my .338. I've got a sub-moa load for my semi-auto now, so I'm not quite sure this is really what I need. My main interest in it was to increase my velocity, without degrading accuracy on my 338, so that I can get further, consistant hits. (I'm talking 2000 yards and beyond) Do you think different sized bullets will need different coating processes? I'm also wondering if you need a different coating process, depending on how fast the projectile is intended to go. Meaning, do you give a projectile a heavier coating of hBN if it is intended to go faster? Maybe the size of the projectile matters too?

If I tried this and didn't like the results, do you think there's any chance that I could permenately damage my barrel? I know that it says non-coated bullets will see advantages with a burnish barrel, but in some ways I wonder if this process is still too new and we don't know what long term results may be. (They've said this about moly too).

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15 years 3 months ago #2042 by zfk55
Replied by zfk55 on topic Re:After a 10 year wait.............. Its coming!
The process has been around quietly in use in firearms for about 15 years and far longer in the machinery industry.
It doesn't matter what size the projectile. The thin coat direction applys to all metal surfaces, firearm or fine machine gears.
If you try it and don't like it you can scrub your bore with denatured alcohol and after a number of projectiles it will be gone. It does strip away with repeated firings, just not as fast as Moly. Both Moly and hBN can be removed.
I'll post our next results.

zfk55
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15 years 3 months ago #2043 by Edge
Replied by Edge on topic Re:After a 10 year wait.............. Its coming!
Well, I got my BB's cleaned and coated. I think I'm alergic to the hBN, because I sure did sneeze after I got a small wiff of it. By the way, is it supposed to smell like ammonia after the BB's are coated?

I went back and read the information posted on 6mmBR and now I'm wondering, becuase the article stated that coating the bullets will actually decrease your velocity, and I want to increase my velocity. I'm a bit confused by this, because I thought "slicker" equated to "faster", but there argument was that "slicker" equates to less pressure which equates to lower velocity. My brain is still trying to figure this one out, because in my mind the bullet should go faster. And I think you have even stated that your bullets have increased velocity.

I also had another question for you. If you already have a load that is ubber accurate, do you think that coating the bullets is going to increase the accuracy or actually have the opposite effect? The more I read on this, the more I'm starting to think that the only advantage is possible extended barrel life. With a .308 that's probably going to go 4000 to 6000 rounds before needing a barrel change, I don't see any advantage to the extra effort.

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