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Several, actually.
For one, most rifles in .45-70 are designed for cast bullets. The leade, rifling and twist rate are optimized for lead.
For another, cast bullets will generally give a bit more velocity at lower pressure than jacketed. That can be important for some rifle designs, where a somewhat weaker design can be offset a bit by the performance of lead.
Finally, almost nothing penetrates better than a hard-cast lead bullet. Most jacketed designs are designed to expand. That may be fine in some game, but in tougher critters like black bear, it is usually a mistake. Deep penetration through the vitals is called for, not a shallow wound.
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