Here is a Lyman (Model 57 I believe) mounted on a 1909 Argentine Mauser that has been re-bored to 35 Whelen. As was said before, just unscrew the peep, and use the hole as a ghost ring. Very fast and accurate compared to regular rifle sights. Last I looked, the Lyman model was selling for about $75.00, and is well made. Requires 2 holes be drilled in the side of the receiver for mounting.
Larry