Unless you are an experienced handloader or have a large bank account, I would not get a .22 hi power for a shooter. Using .224 bullets will not give good results unless you happen to find a specimen that has an unusually tight bore. Norma ammo is one of the only makers. They make damn fine ammo, but it is pricey. Casting bullets is about the only practical answer.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball