For shooting utility - go with the model 1907 sling.
The 1887 sling was primarily a carry strap.
It is very clumsy because it's too long & bulky for the Krag.
(The 1903 Army NM Team made a creative use of sling and swivels).
The Mills Krag canvas 'Tropical' sling was a failure.
The Brass 'C' Hooks were too narrow and caused the strap to curl.
The Lee-Enfield (Mills) sling works well, but it is not correct.