Shooting at ice, is in my opinion the best target thyere is, but there is a season for it.
You can really reach way out there.
My 338LM rifle has now more then 5000 rounds through it, and it still shoots a 3 shot group at 0.75 moa at 2200 meters.
In this video, I used 2 shots to get on target, my ammo was not veryfied, and since I use a silencer, mirage from the silencer becomes a problem after only 3 shots. So the last three shots hit high and low of the group, due to this mirage.
But 300 grs Lapua Scenar works fine way out in the subsonic range.