Round nosed pellets are usually more accurate in 'sporting' springers, than-are the flat nosed or spitzer shaped ones, especially past about 10 meters.
Some guns will however, shoot the flat ones well to 20 meters.
Before the covid plandemic, I shot on an indoor range with air rifles & pistols during the winter with a group.
JSB (Czech Republic) & H&N (Germany) pellets are usually the most accurate, with a very wide variety of designs and weighs per calibre.
These makes shoot best in all of my air rifles and pistols.