Some of the early Omega rifles came with sights that were set up incorrectly. I have an early one but have never shot open sights (check with T/C maybe they have the records ). I installed a scope first thing and went from there. My Omega will not shoot 777 ffg or pellets without a severe crud ring on the first shot from a clean dry barrel. I'm sure there is no contaminant in the barrel and with Winchester 209 primers it is a mess. I bought the .25ACP conversion and it is about 80% better but still too much of a problem for me. Pyrodex shoots well but is very dirty however it does not make the dreaded 777 crud ring. I shoot Black Mag'3 with great results both for accuracy the lack of fouling allows multiple shots without a swab between. APP fffg works well also and I have some Pinnacle fffg that I have just started evaluating. Looks promising at this point. The .25ACP conversion I like for the ease of handling the primers in the .25 brass as they are a lot easier to deal with than the original 209 primers when hunting and trying to get a second shot off if needed. Elk sometimes will not fall down even when hit well; at least that has been my experience. One big cow walked slowly about 50 yards and looked like she had not been hit with a huge hole through the center of her heart. I had reloaded and was about to shoot again when she finally stumbled and fell.