There were very few of the 800,000 serial number used, so that method you will be off. Your rifle would have been made in 1954. This can be verified by checking the section on the front of the receiver where the lever attaches. You will find an oval with a number followed by a letter, if it is a F then it is 1954, G would be 1955. They never got all finished in the same sequence and some sat on the shelf for a few months pushing them into the next year.
The EG had a number of drilled and tapped rifles around 727,xxx - 730,000 but never had them all drilled and tapped until the 750,000 range. All EG had the tangs drilled and tapped, that never stopped until 1960 when the safety was moved there. If yours is factory drilled and tapped for a scope it will have the Model 99 stamp on the left side of the receiver, if someone had a smith do it the screws will go through the stamping. There were a number of nondrilled and tapped rifles that had the stamp on the left and no drilling and tapping, so it can't be proved one way or the other if it is done professionally and the stamp was on the left. Pretty much after 1955 they were drilled and tapped for both.
Hope this helps.
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