Any factory loaded .30-40 Krag ammo should be safe to shoot in your '92 Krag, provided it's in good condition. If you have any doubts, have it checked out by a gunsmith.
Unlike the .45-70, you don't find hot-loaded Krag ammo for the few Ruger single-shots and other modern weapons chambered for the old warhorse.
Violence is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and valorous feeling which believes that nothing is worth violence is much worse. Those who have nothing for which they are willing to fight; nothing they care about more than their own personal safety; are miserable creatures who have no chance of being free, unless made and kept so by the exertions of those better than themselves. Gary L. Griffiths, Chief Instructor, Advanced Force Tactics, Inc. (Paraphrasing John Stuart Mill)