The US krag does have a second lug as does the Norwegian krag, it's on the bolt body and is rotated down when you close the action.
It's located in the top secion of the bolt, under the extractor, it rotated down in front of the right hand front side of the action.
As for the bolt handle "second lug" the Norwegian action has a slot engineered to surround the front and back of the bolt handle, The
US krag has a smaller slot cut into the receiver tang. It's smaller than the Norwegian Krag, but there.
I concur, and there's one leaning against the wall about 2' away.
And given the choice between 'Milquetoast 6.5 loads' or 30-40 loaded to factory spec's...no comparison IMO. 30-40 is a handloaders dream...using .30 cal bullets! Much selection there, lol?
As far as brass, use 303 br if you can't get OEM stuff