As to my own experience, I currently shoot 200 rounds every other week. This out of necessity, due to my budget.
When I was working I found 200 rounds expended per week kept me at my best.
My goal was to be able to hit a foam coffee cup or similar target regularly at one hundred yards with my Super Blackhawk. Or to knock down the ram at 200 meters.
And, up close, to be able to shoot through a fired 12 ga. shotgun shell end to end. This is harder than you might think, as there is a tendency for the shell to twist and the bullet exit the side if it just grazes the mouth of the shell.
And splitting a bullet on an axe to bust two balloons is much easier than you might imagine. You don't really have to split the bullet, as a hit liquifies the bullet and spatter will pop both balloons.
But practice is a definite requirement. Good shooting requires two things: concentration, and physical conditioning.
Bob Wright