I don't understand copper fouling

The priciple is the same as ice skates. Friction doesn't melt the skate through the ice only the narrrow strip where there is contact.

The notion that the brief contact with the grooves is going to melt the entire lead bullet or melt away the copper jacket is not reasonable in my opinion.

Ever noticed the copper splash at the muzzel of rifles? Copper in its solid state doesn't splash over the crown.
 
You're comparing a few degrees to several hundred degrees.
If that's not an apples to oranges comparison I don't know what is.
The splash is abation, the same thing that happens to spacecraft re entering the atmosphere.
 
I do know that the copper fouling on the muzzle crown is a stone beast to scrape off of an M4 to get it to pass armorer inspection...

Whether ablated or atomized liquid, it sucks to clean.

Jimro
 
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