powder burn temps?

[Idaho-Lefty]

As I, "Burn Up" my OLD Gun Powders, I'll be Transitioning Over to, More VhitaVouri, N-100 Series, Powders.
N-160 WAS,. "Special",.. ( High Velocity and VERY,.. Accurate ! ) in Our .243 Win with, Berger 87 gr H-VLD's.
Whenever, I feel the Need to, "Weigh" Powder on a Scale,. I'll grab, the Vhit's ( N-100's )
Still Love MOST Ball Powders tho for, My High Volume, Reloads in, 9MM Pistol, .223 Rem and 6.5 Creedmoor.
Winchester Ball Powders, HAVE Spoiled, this Ole' guy !

 

[Webster]

I want to test if a graphite or a zinc lubricant after cleaning would help with the throat. Fast 6mms are murder

I doubt it. How would you test it. Are you willing to buy a bore scope and maybe 5-10 identical barrels? And shoot 1000s of rounds thru each barrel? A powerful stream of gas at 55,000 PSI traveling at 3000 FPS and maybe 3000F would over come any lube. It isn't a lubrication problem. The best thing is to shoot mild loads that are accurate if you want barrel life.

 

[jelenko]

C

https://apps.dtic.mil/sti/tr/pdf/ADA328657.pdf

To complicated to worry about. After one experiment they stated they couldn't relate temperature to the amount of erosion. You may have to paste the URL into Google. AccurateShooter doesn't like PDF files.

Would you point on the page? I scanned through the whole document but couldn't find any reported findings - only synopsis of what would be presented.

 

[Webster]

C

Would you point on the page? I scanned through the whole document but couldn't find any reported findings - only synopsis of what would be presented.

I don't think it's worth trying to understand. You cannot prevent barrel erosion. All you can do is minimize it by shooting mild loads and cartridges that are not overbore. Barrels are consumables.

 

[jelenko]

Right.
My original question was in reply to another poster asking if hot gases are the cause of erosion.

 

[Doom]

Very informative. Do we assume the higher temps increase throat errosion?

What if throat erosion and fire cracking were results of different processes?

The primary issue is high temperature changes in the metallurgy of the steel due to high temperature. This is what some call fire cracking. It is primarily a surface issue but when multiple shots are fired without cooling it can become a deeper issue. This process damages the steel. The erosion is a physical process that removes the damaged steel. This can happen due to high speed gas impingement and also forces associated with bullet engraving.

The higher the temperature the faster the damage takes place. But it is the temperature of the barrel surface not specifically the temperature of the gasses that determine the rate of damage. Taking it to extremes a slow firing rate at a higher temperature may have a slower rate of erosion than a lower temperature at a faster rate of fire.

 

[wboggs]

The primary issue is high temperature changes in the metallurgy of the steel due to high temperature. This is what some call fire cracking. It is primarily a surface issue but when multiple shots are fired without cooling it can become a deeper issue. This process damages the steel. The erosion is a physical process that removes the damaged steel. This can happen due to high speed gas impingement and also forces associated with bullet engraving.

The higher the temperature the faster the damage takes place. But it is the temperature of the barrel surface not specifically the temperature of the gasses that determine the rate of damage. Taking it to extremes a slow firing rate at a higher temperature may have a slower rate of erosion than a lower temperature at a faster rate of fire.

 

[wboggs]

Makes sense. Thanks for your answer