There are no rights or wrongs except how things work for you. For thirty+ years I have hunted my old T/C Hawken .50 with a Lyman peep. I do not use any insert whatever, sighting directly through the threaded aperture. Most of my elk have been taken on dreary, low-light days, and I find the large aperture allows me a better view of the target without adversely affecting accuracy out to 200 yds, generally my maximum game range.
