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A lot of them have been scoped. I usually see side mounted to the receiver.
Is it a 1903 or a 1903A3? Difference is the 03 has a ladder sight out in front of the receiver. The 1903A3 has a peep sight on the rear of the receiver. If it's an A3 half your drilling is done as the mounts utilize the rear peep sight screw hold.Receivers are hard.
There's a mount available like what's in the picture someone included. If you elect to get the receiver drilled for a conventional set of bases pay attention to the fact the 1903 series of stocks were made for 5'9" shooters shooting offhand.Good luck on getting it scoped. I have 3 with scopes. Two were drilled and the other is a 1903-A4 action that came "factory" drilled as it was intended as a sniper rifle. I only have the action.The Springfields are good shooters so have fun once you get it scoped.Bill W
CBond, if you decide to ditch your ladder, let me know. I am working backwards, trying to restore my grandfather's 1903 to its original glory. I am missing the ladder.
Here is a retro 35 Whelen that's on a 03.
This might a source to consider for your project:http://www.scopemounts.com/index.html?instapics.html