After my examination I came to the same conclusion. Since my 2 bolts in my Krags had the same dings.
Dave at Grandpa's did a good job of packaging and is providing Krag lovers with a way to make them last longer at a very reasonable price.

For those that have a Krag with similar dings massaging them carefully a fine Arkansas hone or careful use of a rotary tool with a Cratex rubber abrasive could make a Krag even smoother. This applies to a NOS or original bolt.
My sporter was head spaced to the original worn bolt so these new bolts will even fit. My dad's original rifle's bolt in automotive terms is not even broken in so I do not even need these bolts, I just wanted to see them in person and add to knowledge her on this site with measurements and a description of what I found.

My reference to grinding marks is about how these bolts were finished, please do not think of someone holding a bolt up to a bench grinder, think more on the lines of a machine like a cylindrical tool grinder. Till fairly recently grinding was the best way if precision finishing hard surfaces. The grinding done on these Krag bolts is very well done and I am not sure how they pulled it off 100+ years ago.
If you can see those marks on a bolt in use that would be an indication that at least the bolt is fairly new, if it is an original bolt the gun has very little use.

Also I am not bad mouthing the work done at SA, making almost a half million bolts this complex is a real achievement, just explaining what I see. The attached photo does show the grinding marks in 2 directions on both new bolts. take a look at yours and see if you can find them now since we know what they look like.

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