Have 5 year old CVA Optima "Pro". Has a SS fluted barrel, 50 cal. I get 2.5 MOA groups consistently with 2 - 50 gr. 777 pellets, and about 1.5 MOA with 120 gr. loose 777 ... all day long. Easy to clean and has been 100% reliable for me so far. Groups are great from about 92 gr. to 116 gr. On mine start to open up above 125 gr. Though it is supposed to be OK to 150 gr., I have not used more than 125 gr. Probably have killed 20 deer with it. it is now my loaner because I moved to a Savage 10ML (smokeless powder). I have killed deer cleanly out to about 165 yards with the CVA. Easy to clean and simple.