To me, long range target shooting means someone trying shoot tiny groups at any range from a bench using magnified optics.
While it can be done with a 6920, as factory issued they will need some upgrades that you can just buy straight up from other companies and maybe even get some extras like a Melonite bbl or 2 stage trigger or free floated barrel that will all have to be added to a 6920.
Now if you are talking about shooting practical targets out to 300 yards. Sure, a 6920 is fine for that. I have hit a 5 gal bucket at 530 yards, several times, from rice paddy prone. (Squatting)
I am no longer participating in gun forums.