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140 A-MAX fails in flight to target @ 2950 fps

 
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  #29  
Old 08-25-2014, 11:27 AM
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Re: 140 A-MAX fails in flight to target @ 2950 fps

Just a data point to add to the jacket heating data.
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  #30  
Old 08-25-2014, 11:42 AM
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Re: 140 A-MAX fails in flight to target @ 2950 fps

Quote:
Originally Posted by jfseaman View Post
These posts go the same direction I was thinking about on a long drive.

I HBn coat my bullets. Lower friction.
It is interesting to note that Berger's study using the thin and thick jacketed bullets used coated bullets.

We've done some careful quantitative studies on the relationships between bullet coating and measured friction, and determined that coating bullets does not reliably reduce friction. See: www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA568594

This study found that in some cases, bullet coating actually increased the friction.

I would regard whether or not bullet coating reliably reduces jacket heating as an open question. Even if it does not reduce friction, it may reduce heat transfer to the jacket if more of the friction generated heat ends up in the barrel or coating material.
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