I did tests with the mk6 mortar and Arma3Legacy146. It worked without troubles.
I did screenshots of the test on stratis. Have look at it. There you can see, that only shooting via bi artillery computer hits the targets. Shooting via "MK6 scope" and via "manual trajectory calculation" is far away from the target. Please roll back your game physics (1.46) and do in future please more testing before sending updates like you did in 1.48. Thanx, i hope, you will correct the issue immediately. A lot of people are angry about this issue. Please think about it...