308 win

Hi fellow stalkers, I just bought a Mauser M18 Pure (the laminated version) in .308 Win caliber and 51 cm barrel. I am also using a Nielsen Paradox 45 suppressor. Now I’m looking at some ammo and I want to shoot lead free. So far my choices are Sako Powerhead Blade, Federal Trophy Copper...

Bought a rifle and these came with it, I don't need them. Googled them and they are $279 new so I guess £150 posted is fair. They look unused/lightly used but I have no clue.

I've noticed that my setup seems to shoot slightly to the right at 200m or if using faster ammunition at 100m. For example, with 150gr bullets (in my 308) I am bang on at 100m, but 1" to the right at 200m. With faster 110gr or 130gr bullets I am 1.5" to the right at 100m. Can anyone explain what...