Your rifle appears to have had the "Hatcher hole" during rebuild at which time or even long before, any W&S holes from the bracket would have plugs. These plugs are often very difficult to remove as I have had friends that did find WW1 SA barreled actions at the CMPicon with the W&S holes and plugs. Sometimes they used a different size screw to plug the holes.

Another idea is that perhaps a Jaeger or ECHO bracket ( or something on that design) was mounted at some point in time and later removed ?