too hard assignment for Semi-Auto

I already play BFv for over 100 hours(BF1 for 1266 h, BF4 for 60 h), and I feel the last master assignment of ASSAULT CLASS is too hard to be done, especially for S-Auto guns, like G43. Get headshot kill in obj area is too hard for them and this assignment will refresh every round, it really make me upset and discouraged. To finish these assignment, I need stay in a obj area to shot other SMG , AR or MG face to face and get 2 headshot to kill them, for guns which have full-auto mode, this assignment is much much easier to be done, but for G43 and SMLE, it just too hard (because the shorter TTK than BF1, S-Auto guns are more weak in BFv). Compare to the master assignment of SMGs, the master assignment of Semi-Auto looks like a impossible mission. (I finished the master assignment of KP/-31, EMP and M1928A1)

I tried my best, work hard for 30 min, and when the round is done, i only have 7 headshot and it renewed in next round, it make me feel really bad.

The biggest problem is the task will renew in next round and it seems like cannot finished in one round, if it can be finished in many rounds, that will be great, or change the headshot into other requirement.