"pooletx" - Welcome to the KCA Forum and good job of posting meaningful pictures.

You are correct that your Family Krag was built in early 1903, approximately Feb. or March.

Your suspicions are also correct. Your Krag  barrel was shortened from 30 inches and the front sight was remounted. Springfield Armory did a much neater job of contouring and brazing the base to the barrel.

Someone in your family needed a handy rifle for 'Hunting' and shortened the Stock and barrel.

Note - Your barrel band is missing its sling-swivel and the "U" marking should be on the right-side of the rifle.

You have a Krag 'Sporter' that shoots accurately and probably served your family well. There's dignity in that. Enjoy your heirloom.