Who knows why Remington uses whatever system they do, really. I don't think what they did prior to 1962 has anything to do with how the 700's were numbered though. I have an xp100 that is a 4 digit number so I'd assume each model, like a 722 vs a 700 does away with any relevance to the number system they made prior to 1962 and the 700s. Bottom line with 700's, we're dealing strictly with 1962 and forward. I don't think what they did on different models should be considered a factor to the numbering system.Got a reference for that? "Early" for a 700 would be 1920s. I have a 1967 700 Varmint Special with 6 digits on the receiver. Supposing there was a correlation netween those digits and build date, why would the number of digits increase from 4 in 1962 to 6 only five years later? We need an outside reference to explain the significance of receiver digits which Remington chooses not to publish. And Blue Book Of Gun Values (the "Bible") chooses not to mention anything other than the letter code on the barrel.
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@Dans40X might know something. He knows the 700's quite well. I know there were small differences that can somewhat date them, such as the neck of the bolt handle just above the knob itself. On earlier ones, that area was smaller and more round than later but I don't remember dates that make that little difference significant to dating them. Maybe Dan will.