I can get about 2-3" at 100 UNTIL the barrel starts to heat-up .... then it will spread to 4-5" with an occasional flyer.
I do not know much about the new ones except they are reported to be a little better due to a stiffer/heavier barrel. I think the real problem with mine is the barrel harmonics. When it gets hot, it flexes and accuracy suffers. Just make sure it has a heavy barrel and not the pencil thin barrel used on the older models.
I really like the weapon - its looks, handling, and operation. However, if you can't trust your life to it, it is of little use to me. I have got one more thing to try. I am going to add a barrel support and see if I can reduce the flexing. A task that is not at the top of my "to do list" right now.
Let us know what you decide!!