Erangel is a big map there is greenery,people hidden in bushes , taking cover in trees, peeking from grasses and tonnes of buildings with hundreds of ridges so 8X scope and Kar98s aren’t easily available,But in the places described below you have the best chances to find them.
1. Mylta(the small building near the nuclear Ones)
2. Military base
3. Georgepool
4.Novorepnoyo
5.Pochniki .
6.Shooting Range
Keep in mind that You will not get 8x scope Every time in same building and every time the place where 8x spawns keep on changing but in the same radius also it depends on your luck.
Secondly after around 12 mins chances of finding 8x in Supply Drops is very high.
Now, its true that the risk factor in pursuing Supply drops is high, but the loot might be worth it.