Zero your wind and see what it reads. Should be spot on.
Also, using a 100 yard zero will cause your further shots to be more accurate the further out you go. Same with all abs programs.
Give it another shot and report back.
No plastic, please trust me on this. Zero. There is a 3rd piece that holds the brass and stainless together on the inside. I've watched it formed together and there is no plastic.
Same ammo as link below, works very well...
The main reason I like the rifle/ammo combination is a 16 inch barrel sending a 140 3k. I have a pile of guns that will push that bullet over 3k, none that can safely do it with that barrel length. Makes for a fantastic backcountry pack gun.