I have a marlin 30AW (similar to a 336) 30-30.
I fired a box of federal 170gr with no problems. I then switched to Remington corelokt 150gr ammo and had four FTF in a row. The four rounds showed no real impression of the firing pin on the primer, just a faint mark.
I switched with no other changes to Winchester 150gr and federal 150gr and fired a dozen rounds with no problem and normal primer indentation. I tried the Remington again and had the same FTF occur. Switched ammo again and no problem.
I'm stumped why this occurs. This is all new ammo not handloads
I fired a box of federal 170gr with no problems. I then switched to Remington corelokt 150gr ammo and had four FTF in a row. The four rounds showed no real impression of the firing pin on the primer, just a faint mark.
I switched with no other changes to Winchester 150gr and federal 150gr and fired a dozen rounds with no problem and normal primer indentation. I tried the Remington again and had the same FTF occur. Switched ammo again and no problem.
I'm stumped why this occurs. This is all new ammo not handloads