The "highest" was a typo. What I ment was tough. I am trying to work as well you know
I am not an engineer, so my knolege of metalurgy is on very deletant level.
In my phone conversation with Hk technician about a year ago, this question came up, and I thought that P7s are made of 4140, but he said that I was wrong and they make them from H13. Knowing that H13 is instrumental steel, and that P7s are dificult to machine, I put 2 and 2 together. It appears that I got 5.
Sorry for the confusion.
I am not an engineer, so my knolege of metalurgy is on very deletant level.
In my phone conversation with Hk technician about a year ago, this question came up, and I thought that P7s are made of 4140, but he said that I was wrong and they make them from H13. Knowing that H13 is instrumental steel, and that P7s are dificult to machine, I put 2 and 2 together. It appears that I got 5.
Sorry for the confusion.