You see my friend, it goes something like this...
Long range hunting is alot more complicated than just which rifle to buy...
To be successful at long range hunting and not just taking pot luck shots, you need not just a rifle but a long range hunting SYSTEM.
The bare minimum system comprises of the following elements;
1. A Flat shooting rifle with excellent inherent accuracy.
2. A good quality Scope with elv and windage turrets or reticle, that always tracks reliably and repeatably.
3. Accurate, precision made ammunition usually hand loaded, using high BC projectiles.
4. A quality laser rangefinder to measure the distance to your intended game.
5. A ballistic computer, or table or card or some other reliable, accurate means of determining the required elevation and windage dope from the range measurement and environmental conditions of the moment.
6. KNOWLEDGE and UNDERSTANDING on how to put it all together to make successful shots at long range.
There is a HUGE amount of other stuff that inevitably ends up as essential gear in order achieve the above points.... tools, instruments, other equipment etc etc
The point is, it gets very in depth and also quite expensive. Therefore, its virtually impossible to simply "have a dabble" and see if your going to stick with it. Its something you have to commit to from the beginning, with the right gear, tools, knowledge and understanding or you will never be successful at it.
So, i encourage you to read more, on this forum, as everything you need to know is here. Using the search function will net you the most information in the shortest time, and arm you with the knowledge to answer most of your own questions