How did you determine that the cocking pin is hitting the bottom of the cocking ramp? When the firing pin is in the fired position does it rock back and forth or is it impinged tight against the bottom of the ramp?
If it does rock back and forth easily, I would either pull the cocking piece pin out and remeasure the protrusion or disassemble the bolt and slide the firing pin into the bolt head and check the protrusion while out of the bolt body. Verify the restriction. You are right that under no circumstance should the cocking pin touch the bottom of the ramp as I think you understand. The firing pin stop should slam against the back of the bolt head when fired.
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