There's no feed ramp on my Nambu, just a slight bevel at the 6o'clock position. Yours is much larger. Maybe someone Dremeled yours out, or they changed that profile over the years (mine's a 1937). I've shot mine with Mr.Nambu loads and some ammo remanufactured from .40 S&W brass and it functions fine with the original springs. I'd kinda doubt that making that bevel larger would cause your problems though.
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