Can you shoot them all good?
As was pointed out, what is the meaning of "good"?
Compared to the majority of people I see at the ranges I visit, I maybe ought to feel I'm doing well, but I'm not even close to what I'd like to be able to do. My goal right now is to put 20 bullets into a one inch diameter circle at 15 yards from any of my handguns. Much of the time, I can now do it with a three inch target. Some people say that's "good" or even "excellent". I don't see it that way, and my ability to do even that fades away after 50 or so rounds, as my body gets tired. I wish I was 19 or 29, not 69. Oh well.
I read every bit of advice from the "masters" I could find, and then re-read much of it. I decided to force myself to follow every bit of it. I had a pair of eyeglasses made up, with a prescription for the distance from my eyeball to the front sight. Now the front sight is always crisp and clear, and the target is always a blur - with no effort on my part to get my eyes to do that.
I go to the range, and put 3 bullets into a revolver, so if I ever try to flinch or something, it will immediately be obvious. That idea seems to be working.
I'm shooting 38 specials in a gun designed for 357 magnum. I can't see any point in shooting anything more powerful until I'm "good enough" with the lighter rounds.
All the guidebooks say practice, practice, practice, and while I can't get to the range that often, I can certainly do a lot of dry firing.
I guess I have two goals right now - the first is to get to where the groupings are ALWAYS inside of that 3" target, better than rarely (a year ago) to often (currently). I keep looking for ways to improve, but I figure 99% of what's needed is for ME to learn how to do better, not from any changes I might make to the guns or ammo.