Find out what your rifle likes. From your post, you appear not to have much experience shooting. It takes alot of practice to reach the full potential of "target grade" ammo. Start out with off the shelf ammo that your rifle likes, then when you are to reliablely keep all the shots in the X ring, move up to the higher grade ammo. Eventually, you may need to reload your own to find the maximum potential of your rifle.
This is what I do. Shoot the cheap ammo when having fun shooting. The only exceptioon is my M39 Mosin Nagant. It shoot under one inch groups with out of the box Privi 150 gr sp. I found this out by buying a box of that ammo to get some reloadable brass. Don't need to reload now.
It takes a long time to precision shoot. I have been shooting over 50 years and I have not reached that level yet. Mainly because I don't have the desire to reach that level. However, I would hate to get into a gunfight with me....chris3