To my knowledge, CVA- the gun company-- never made or sold round balls. Unless you actually measure the diameter of your bore, and the diameter of the round balls, you can't possibly know what you are buying or using in your gun.
GET A CALIPER, and use it to answer these questions. Dial calipers are available for less than $25.00 from most of the suppliers listed here under " links". A good dial caliper will serve you the rest of your life, assuming you take good care of it. The ones made in China are just as good( or bad) as those made here, and cost less.
Those balls you bought just may be very much oversized, and you spent your money unwisely, simply because you didn't actually know what you were buying. Don't hesitate to take rulers, tape measures, calipers, or micrometers with you to any store to measure what they are selling. You are not the first shooter to buy something he can't use. All of us have Lots of " Trade items" we have picked up over the years. :rotf: :shocked2: :thumbsup:
IF these balls were mis- marked, take them back and ask to exchange them for correctly sized balls, or for your money back. :hatsoff: