Posted this before many threads ago, but will post again as it's relevant to your point.
Martin Hood (Sky News) - South African legal expert
The evidence has been that Oscar was shooting one handedly from a position where the gun was at his waist level, and in my experience, and I own more than one firearm, in order to shoot a group like that, you have to have a very firm grip on the firearm, and normally that group is with two hands. And the fact that the group is relatively small, shows that Oscar knew how to hold the fiream properly, and in all probability in my view, and if I were called to be an expert,
I would say this - he held it with two hands, and he held it very deliberately to get that grouping at that level.
When you're holding a firearm with one hand, and you're in that very excited state of mind that Pistorius said he was in, you're going to have a lot of shake, and you're not going to get such a small group as that. It's going to be all over the place. The fact that it isn't, in my view suggests that he had far more control than he actually is prepared to admit.