I just finished mounting my new scope on my new 455 Varmint and man that thing looks slick! The scope I went with is the Vortex Diamondback 3.5-10x50. I opted for the Leupold high rimfire rings. Got the rings mounted where I wanted and went to mount the scope. Noticed the bell was contacting the top of the barrel. So I had to cut two shims and that brought the scope off the barrel just enough. Looks killer and I can't wait to shoot it!