i would suggest you start with a smaller calibre, as learning to shoot with a larger calibre leads to flinching due to anticipation of recoil..
your not just gonna go out and start shooting at 500 yards , it'll take a while to learn the skill,
So i'd suggest you purchse a smaller calibre like .223 if you want to jump into centre fires right away....
otherwise i'd say go for a .22 lr for a few months and learn the basics, safety. wind, ranging, marksmanship....
.223 will get you to 500 yards if your able to read the wind well you'll be accurate...
i'd suggest you