Interested to see what the outcome of your "testing" produced. IMO 5 rounds mean nothing. Many rifles can come up with a good 5 round group. Start putting some rounds down the tube (15-20) and then see what your groups are. You may want to think about mixing different ammo at the same time. Different manufacturers utilize different lube on the bullets. "Mixing" this lube in the barrel WILL NOT produce consistency. It will produce goo and gum. Don't believe me, do it and then look at your barrel with a borescope. Many rimfire shooters think you don't have to clean your rifle. My response, go to any serious competition and you will see shooters cleaning their rifles after the match just like centerfire shooters do. A clean firearm is an accurate firearm.
Good luck with the test.