Your firing pin protrusion should be about 35 thousands. People that prescribe to the old mauser rifle belief will tell you that you need 50 thousands of firing pin protrusion. There is more to firing pin adjustment than meets the eye. You need a certain amount of total firing pin travel to have proper ignition, and that number is 220 thousands. To measure firing pin travel you will need to buy another back action screw, (BAS) and a dial caliper. You can take the simple approach and buy one (BAS) for a accu-stock gun that has a hole in the back of it, or you can buy one and drill a hole in the back. You need something for the caliper you index off of, and this is where a "gunk button" (Made by SSS out of a 38 special case, and a ball bearing.) pays off. You cock the rifle, and measure off the BAS with your calipers where the firing pin is at, then pull the trigger de-cocking the rifle and measure again. The difference between the two numbers is your firing pin travel, to get total firing pin travel you need to subtract your firing pin protrusion.