$800 Bushnell Match Pro ED. Area 419 20 MOA 1 piece mount. Shooters Global Pulse level.
**** Spend all the rest on quality ammo and enjoy the sport. Adventure out to your local PRS Rimfire or NRL22 Club match. You will see how much fun it is and want to join in. But if I am reading between the lines here you are looking into Long Gong. You can enjoy that as well but you need some of the most consistent ammo you can test. Start buying Eley Match, Eley Team and TenX test lot bricks. Buy the ammo with the best number and corresponding groups. First test is 50y, 100y, 200y & 300y. If you have multiple lots with very close numbers ( 3-4 SD & 12-14 ES ) choose the lot that has the roundest groups at distance.
Info you did not ask for but is much needed in reaching to 300y consistently.