I have an older Burris 2-7x32 on my 7-30 Waters carbine barrel. I sighted it 2 years ago and haven't touched the settings since. I bought a new Leupold 2-7x32 Rimfire for my 22LR match carbine barrel 2 yrs ago. and I can get at least 3 holes out of 3 touching, sometimes all 3 in the same hole.......head shots on squirrels at 40 + yards......
Some time ago I bought a 22 Hornet carbine barrel from someone on this site. I thought I would go "low to lower medium" for a scope and bought a Simmons 8 Point 4-12x40AO. I took it out today and shot it for the 1st time. The 1st three groups were close to POA after having it bore sighted. I made a couple adjustments to get on the X. Group #4 was looking not too bad. Suddenly, group #5 was not too bad, except that it had moved some 10" to the right and down 2". There was very little response to adjustments to elevation and windage after that. I guess that Simmons was for the occasional shooter......20-30 rounds of 22 Hornet.......
That will teach me to look for a better name scope.