You didn't place much of a limit on this question! No doubt the "best rifle ever made is/was a custom job, not a factory product. If you had said " 'best brand or best model' made since (date) it might be possible to give a reasonable answer. As you phrased it, it is NOT POSSIBLE to answer....... There were some beautiful rifles made in the 15th and 16th Centuries.......

(Which HENRY do you mean?? The predecessor to Winchester, or the current company??)