"For a newbie, it's often suggested that if your gun happens to be multichoked, one wouldn't be far off by sticking with 1/4 & 1/2. I asked about changing the chokes up to much tighter on here years ago, with the principal that if you can consistantly hit with a smaller spread, theoretically one should surely be more accurate in general, and that theory was quite roundly blown out the water, but with no-one actually seemingly able to give a reason why. (still seems completely and perfectly coldly logical to me even now!)"
What do you mean by constantly hit - 80%, 90% or 100%. If you can hit 100% alls good. If not then open the chokes up a bit and take the extra kills. The choke can be as wide as possible until the clay slips through the pattern.
If you are less that 80% I would suggest its not constantly. Thats me - On a really good day I am 85% at sporting and my problem is rarely missing all the clays from a single trap but repeating the kill four times. I know where to place the gun but need shoot more to repeat it.
Most Newbies - that is those who have not shot enought to understand the principles and therefore are able to make up there own mind - will end up missing (some) clays with tight chokes which they would hit with more open ones. They do not know why they miss. An instructor might. Try sticking in extra full chokes and nipping off for a round of Skeet - the pattern is the size of a dinner plate and even when you know what you are doing it will be hard to adjust to such fine margins without many rounds of repetition.
If you not a Newbie and do understand the principals then you can shoot what you want. Most here though shoot in the 3/8th to 5/8th band and those are usually accepted as the best for scores (when you don't change between stands).