Well - I have the problem that any gun I shoot besides my P99 is not as accurate for me. I don't have the steadiest hands to begin with (I have a childhood injury to my left elbow to thank for that).
But, I have my P99 - and then every other gun. While it irritates me to no end that I can't consistently shoot as well with anything but my P99 - I've learned to accept it. So, I have the P99, and then if any other gun gets into my usual realm of accuracy with typical handguns, I've learned to be satisfied.
I have my exact round count for my Five Seven at home, but I think it's 400 or 500 rounds. I find the trigger a bit tricky to find the exact breaking point. I have taken it to the range 4 times now. On the 3rd trip, I hit the Zen spot and did very well with it. For whatever reason, I figured out the trigger after a few shots and did fantastic with it. But, on my last trip, I went back to the usual grouping.....
The Five Seven is my night stand handgun, because the 197 ammo will penetrate less interior walls. And, I can EASILY hit a human sized target with the gun - should I ever need it. So, that inch or two extra in my group size doesn't concern me really. Not for that purpose. But yea, it can be irritating at the range.
If I sandbag the gun, though, I get awesome groups. In fact, I adjusted my sights to bullseye at 7 yards - since it is a home defense weapon. I think it was zeroed originally at a further distance.
So for me - its not the gun - it's just me.
I shot my USPc low for a long time. It took 800-1000 rounds to stop doing that - and I don't do it with any other gun unless my hands get fatigues after a lot of shooting.
If the ammo wasn't so expensive, I'm sure I could have 1000 rounds thru it by now, and I'd have that trigger figured out a little better.