Shooting off hand at longer range is more of a mind game than many realize. If your mind tells you that it is difficult then you will jerk the trigger and miss. Know your sight picture, let the rifle settle, and "rapidly SQUEEZE" the shot off. No jerk, just a rapid squeeze that some, including myself call a command detonation. This usually done in conjunction with an interrupted trigger squeeze to get the trigger "set".
Holding the Barret in the standing off hand is not hard. It is balanced on the mag and as you can see in my avatar, I let the mag rest on my palm very similar to an offhand stop for international shooting. The weapon is actually more pleasant to shoot in the offhand as the back blast and recoil is less, as is the over pressure, no ground to bounce it back at you.
__________________
Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard.
Experience is what you get right after you need it.
Author unknown.