That is not a shadow.  It has been ground as you said.  I've tried to get an end on picture of both the 98 and 96 sideplate, but I have been letdown by either technology or technique so far (possibly both).

I cannot (and will not) say that this wasn't a ceremonial rifle.  The bore is shiny dark with some pitting in it.  But not nearly as bad pitting as some known ceremonial rifles I've seen.  And I've had rifles that were more pitted than this that shot well - so if the throat isn't burnt out I have high hopes.  The muzzle measures just over 4 on the gauge I use for my Garands.  Not sure if this is a proper measurement device for Krags but .300 diameter is .300 diameter right?

I am also fairly confident, given the evidence and your expertise, that this is a 98 sideplate someone has worked over.  In a quick look, didn't see anyone advertising a 96 sideplate and for something this particular, wouldn't trust just any part supplier.  Ideas?

I also checked the spring pressure of one of my 98s with the sideplate removed.  An 'inginiir' would say that the 96 is about 2 or 3 smidgens less than the 98 'but close enough for govmint work'.

As always - thanks!