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Looks like a Wolf in Herter's clothing.
Gunner,
You asked....
"how can the very soft steel in a case harm the very hard and tough steel in an extractor?"
OK,..... How can water harm very hard and tough stone? If you flow enough of it over it's surface......that's how.
Brass is harder than water. I don't get your point.
Have you ever wondered why brass is the preferred metal for ammo casings and keys? This is because it is soft and IT wears rather than the gun parts or lock parts it is constantly dragged across or inside of. I think brass is used for keys because it won't rust.
Keep in mind that though a steel casing may SEEM soft I believe that is mostly due to it being thin No, it is soft because it is low carbon and not heat treated to be hard. and simply more malleable than a comparable thicker piece of the same material. Thickness has zero to do with it. If it did, good knives wouldn't stay sharp. You can't make a knife from cartridge steel, and you can't make a barrel or extractor from it either. If steel casings are so soft then why doesnt everyone use them? Combloc countries use steel simply as a cost savings. I realize that, but it doesn't answer my question as to how the very soft steel in a cartridge can accelerate wear on much higher quality and very much harder steel gun parts.
I hope that answers your question.
Gunner,
I am pretty sure that keys are made of brass rather than steel so that the key wears rather than the lock. Have you ever seen an extractor wear? I have and it was done by shooting a lot of very soft brass through it. My mentioning of water wearing on a rock was merely a reference to how something softer can wear something harder....with lots of time. Of course steel cases are going to be softer than an extractor, we both know that. CHeap steel and all of the detailed things you mentioned..... but even cheap steel is harder than brass. Don't you feel there is any credibility to my suggestion that steel cases will wear an extractor faster than brass?
If brass will wear an extractor then steel will certainly do so and more quickly.
Keep in mind that though a steel casing may SEEM soft I believe that is mostly due to it being thin and simply more malleable than a comparable thicker piece of the same material.
Looks like a Wolf in Herter's clothing.
If you wanted a steel key that wouldn't wear out a lock and that could be used on a key cutting machine you could use very soft steel like they do in cartridge cases. The problem is that the key would rust in your pocket. You couldn't fight that by chroming the surface of the key because keys ore often cut on site, removing any plating from the edge.
Some bmw motorcycles use steel keys - many locksmiths can't cut them because they are too hard for their machines.
Even relatively soft steel is quite a bit harder than brass.
Gunner,
Bro, you are clearly very into this subject and I applaud your level of knowledge and enthusiasm.
I apologize for my less than scientific responses to this question but let me simplify all of what I am trying to say.
Even soft steel cases are harder than brass and as such, I Believe, will wear your extractor MORE than brass.
Seems logical to me.