To add my 2 cents (for all that it is worth)
IPSC requires that you only have to be accurate enough, it is not precision, there is a little spray and pray in comparison to other sports.
The "A" (highest scoring) zones are comparitively generous.
If you can consistantly shoot 4" groups are 50 Metres that is normally plenty accurate enough.
The Sport of IPSC is a compromise sport, you need strike a balance, of time, accuracy and power. Too much of one and you effect the others.
There are very few standard courses of fire in IPSC, so it is always a bit of the unknown, you don't have a set time, and all you know is you need to complete the course of fire faster and more accurately than anyone else.
You can never practice a course of fire, all you can do is practice your gun handling skills, and shooting skills.
Planning the way you intend to complete a course of fire in IPSC is a big part of it, and can only be done on the range on the day.
It is this combination of elements I enjoy.
[I do shoot ISSF too, which is all about accuracy, but it's not as challenging]
"A" Zone at 50 Metres, good enough for me.