Dennis,
I have a listing for a J. Hofner, perhaps a misspelling, in Marion County, Marion, Ohio. The date I have is considerably later than what you have, I have him in the cencus of 1859. He had $600 invested in his business and had 2 hired hands he paid $50 per month, for both. I say it may be a misspelling as I also have a picture of a rifle marked "J. HEFNER / MARION, OHIO / No. 269. The rifle is a curley maple fullstock with a 3 piece patch box. The rifle is a percussion. Hope this helps a little in your search.
Mark