.22 ammo
There are many that believe that subsonic/standard velocity .22 lr cartridges are generally more accurate overall....consistently shoot smaller groups, than the hi-velocity fodder. By example, high dollar, dedicated .22 match ammo is all "standard" velocity.
There is another belief that .22 std velocity is more accurate at longer range (100 yds plus) as the slug does not loose stability as it slows from transsonic to subsonic speed out around 75 yds or so......
All well and good, but it may take a very high end rifle, optic and conditions to determine that........most .22's are of the sport and plinker ilk and we are happy with what accuracy we can get, at the standard plinking distances we mostly shoot, period. A blue collar .22, with bulk ammo that will shoot into 1 inch or so, " inches at 100 yds, is a good .22 indeed, but is not the norm.
You may not find that hi-vel ammo will make a big difference in your ability to hit at 100, though it will likely flatten your trajectory by an inch or so, you will still be 5-6 inches low out there with a 50 yd zero. You may find that the hi-vel groups may be bigger. You may find no distinguishable difference in group size between the two.
But by all means, keep shooting and learning. Best to you.