I have a ca.1978 .30-30 Trapper, and love it to death.

I don't believe in shooting "groups" with such guns, though.

Once sighted-in, I only take one shot each, on 10"x 15" cardboard ovals, cut from the side of boxes to simulate game's vital zone, and placed out at random distances between 10 and 125 yards.

About 80% are hit very close to center, with 97% getting hit somewhere in the oval.
That's "game accurate" enough, for me - although YMMV, of course.

I set mine up wth a fine FO front & Lyman peep.(I also peeped the Henry, after this pic was taken)

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It ain't no fun, when the rabbit's got the gun