Technical Question.

Does anybody know the actual size and thread pitch on the scope mounting holes of a Remington 700 5R receiver? They look to be #6 screw holes, but the thread pitch appears to be finer than 40 TPI. Or are they 5-40? Or metric? Evolution Gun Works says the screws they ship with their bases are 6-40, but they don’t fit the holes in my rifle.

A web search has netted me nada on this question. Even AR15.com has not been helpful.