I got the cheapo from Walmart. Similar to this....
http://www.cabelas.com/cabelas/en/templates/product/standard-item.jsp?_DARGS=/cabelas/en/common/catalog/item-link.jsp_A&_DAV=MainCatcat602006-cat200006&id=0012854711491a&navCount=2& ;podId=0012854&parentId=cat200006&masterpa thid=&navAction=push&catalogCode=IJ&ri d=&parentType=index&indexId=cat200006& hasJS=true
I have used it on a .223 and also a .50 muzzleloader. Both were within an inch side to side of point of aim and 4-5 inches high.
I waited until about midnight and shinned it about 100 yards down the road on the side of a house. Adjusted the scope so the crosshairs were dead on the red dot. It took about 10 seconds. Then went out and shot the next day.
Next time I will do it, I will adjust the scope to just a little above the red dot.
I would highly recommend it.