"I am not good enough for competition shooting" Sure you are. Competition makes you shoot more, move you away form hot loads and it's fun. most new shooters are using factory ammo, it has more recoil then most re-loaded ammo for target shooting. 1150fps vs 1040fps. also look in to getting some trigger work on your gun, this will help your shooting skills a lot.
Vihtavuori does burn clean when loaded at 90-98% of max load. this is why most target shooters run N320 when using Vihtavuori. It burns fast, has a softer recoil and you make power factor at 95-98% max load, this makes it burn clean & makes good groups. the soft recoil helps the shooter shoot better(faster & more accurate).