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Why is there no coatings used in rifle throats to slow erosion?

 
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  #8  
Old 11-30-2011, 08:34 AM
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Re: Why is there no coatings used in rifle throats to slow erosion?

Some very good points guys!

It would seem that some coatings can be successfully applied, but is the bigger question possibly in finding the RIGHT coating?

I know it has to be a pretty brutal environment with not only tremendous heat and pressure, but also the friction from burning and unburnt powder blasting away at the surfaces.

Kinda makes me wonder if anyone out there is trying to coat a throat or barrel with diamond dust? Sounds crazy at first, but they're using it in sharpening "stones", for coating certain tooling etc. So maybe that could be an option worth looking into?

'guess I need to research how they apply diamond dust to things......
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  #9  
Old 11-30-2011, 09:36 AM
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Re: Why is there no coatings used in rifle throats to slow erosion?

Quote:
Originally Posted by Coyboy View Post
aplication would be near impossible, remember the reamer is only cutting out a small portion in the throat, coating just that portion to satisfy the film thickness issues would do very little to prevent erosion in the groove and lands just ahead of the reamer cut. so You may prevent erosion right where the bullet sits but what about .020" in front of it?

Afraid the best we have to date in Nitride treatment. And that has not been a popular option to date, I think popularity lacks a bit just do to the fact that many switch calibers or cartriges before they have worn there barrel out.

Cowboy, I know nothing about barrel prep procedures but. What if they were to cut the throat deeper (on purpose) and then build it back up to tolerance with a coating that is being talked about. The same step for the groove and lands. That would seem feasable wouldn't it? Cost would probably be through the roof but that could be part of a custom build instead of a factory app.
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  #10  
Old 11-30-2011, 11:31 AM
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Re: Why is there no coatings used in rifle throats to slow erosion?

This is a good thread.

My explanation of the OP's question is that when it is wanted bad enough someone will make it happen.

Desire will have to be big enough to overcome the blood, sweat and tear tuition.
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  #11  
Old 11-30-2011, 11:23 PM
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Re: Why is there no coatings used in rifle throats to slow erosion?

Exactly roy!

I'm the type of guy that I think a lot of the membership here is--see a problem, find a way to fix it.

This seems like a feat that is so full of difficulty that isn't worth pursuing at first, but the same can be said for the distances that we now shoot game animals too. Once upon a time, you were considered a great shot if you could routinely hit what you were aiming at out to 300 yards. Now 300 is a total chip shot to most under normal conditions.

I just hate the idea of investing so much time and money into the most amazing cartridges that we now have access to, only to know going in that the barrel is going to be "shot out" with less than 1000 rounds in some cases. No one is going to "stop" throat erosion entirely with the technology that we now have. But if we could slow it down considerably, we could all play with our expensive rifles a little longer before having to reinvest all over again in the form of a new barrel.

Here's some light reading for anyone interested:

http://www.riflebarrels.com/articles/barrel_life1.pdf



and a video on salt-bath nitriding featuring Joel Kendrick:


As was stated before, the salt-bath nitriding seems to be the best solution at the present time and fortunately for us end-users, it's in no way a new procedure. Apparently the idea struck defense departments sometime shortly after WWII. So there has been a lot of time to perfect it as a barrel treatment.
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  #12  
Old 12-01-2011, 08:30 PM
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Re: Why is there no coatings used in rifle throats to slow erosion?

I asked this question in another thread and was directed over here. I talked to Joel Kendrick today, who supposedly is the best known melonite applicator, and he says he can turn a barrel around in a week. He has been using the melonite process for about 6 years in his own barrels for competition. I also talked to Krieger barrels, and Mike told me that he thought it was a good idea providing the guy doing the work really knew his stuff. He said the temp is very critical and very near the point of taking the temper out of a barrel. When done correctly, he says there are no down sides........Rich
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  #13  
Old 12-01-2011, 08:48 PM
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Re: Why is there no coatings used in rifle throats to slow erosion?

Thanks for stopping by here and giving us your input, elkoholic!
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  #14  
Old 12-01-2011, 09:08 PM
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Location: Fredericksburg VA
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Re: Why is there no coatings used in rifle throats to slow erosion?

Joel has done two barrels for me and so far they are working very well. One is my 338 Lapua AI and the other is a 300 WSM 1k BR gun.

I worked the loads out again for the 338 with the new Hornady 285 from the old 300 SMKs and it is just as accurate if not more.

The WSM has not worked the loads down to be consistent .3 or better at 500 plus where it needs to be. That will be done this winter and spring.

BH
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