g'day cobraa,lol.nice choice for a rifle,what are you doin shootin roos with it?i was under the impression that firearms were restricted in Australia.anyway,as far as scope choices i would say the best bang for the buck would be a Nikon prostaff,Leupold rifleman,burris fullfeild 2.that would be my choices,i have a bunch of the nikons,2-7 compact i like them for deer rifles,we seldom shoot over 100 yds here,i have a half dozen or so Leupold's in different configurations all top quality but the rifleman series would be closer to the $ you want to spend.i have recently purchased a couple burris fullfeild 2,i am very happy with them,maybe a few $ more than what you want to spend.i guess it depends on your magnification needs.
sorry i cant help you on the ammo i only shoot handloaded rifle ammo and don;t load for the 243.good luck with your hawkeye,i think you'll be impressed,i have one in 358 win.with a burris 3-9 ff2,will do sub moa at 100 yds.only mod was to float the barrel.later adker