Ya know, as I re-read through this post, it occurs to me that you said you don’t really know how to shoot a rifle, and let’s say it will take you about 1,000 rounds of ammo to properly learn how to shoot a rifle. At over $1 per round for decent 308 ammo, that’s over $1,000 just to learn how to shoot a scoped rifle properly.
Here’s a thought, buy yourself a $500 bolt action .22 rimfire rifle, or even a semi-auto, and a case of 5,000 rounds of decent quality CCI type rimfire ammo and have fun learning to shoot a scoped rifle. The rimfire rifle and ammo will cost less than the 308 ammo and it will be way more pleasant to shoot. You can practice at much shorter distances from 25-100 yards, and if you choose properly, the scope you buy will work perfectly on the rimfire, and then also on the 308.
When you’re done, you’ll know how to shoot a scoped rifle, will have learned a LOT about rifle shooting and scopes, and will have a nice rimfire rifle to play with, or introduce others to the sport of shooting without all the noise and recoil of a 308 rifle. And you will have saved a decent amount of money.
Just a thought…