My personal preference would be for poults everytime, and doubt i'd ever change ,
Generally speaking the advice is a bird should be around 20weeks at time of shooting to be fully mature and flying well althou size/bird density off pen and the ammount off pellets u feed them plus the weather all can effect when there ready to shoot.
If ur a smaller diy sydicate and shooting in oct or early nov isnae important u could hold off gettin birds till 3rd week Aug or even slightly later, (the latest i've released was 22nd Sept not ideal but some sort off mix up/fall out with the then shoot captain and game farmer, far from ideal and not advisable) but if ur happy walking boundries for small bags off 'long tails' slightly later may suit u better aswell as prob suiting the gamefarmer better as all the big shoots will want there birds that busy 2-3 weeks in july. Sometimes gettin ur birds later means they wander less as by time get the wandering bug the days are getin consderably shorter
We experimented 2 seasons ago gettin birds earlier and only delivery date available was around mid june came the 18th, came on great prob shootable by sept easily, but an awful lot of work feeding and holding them for all that extra time, cost us a lot more in feed than usual far to early and too much work for the type off shoot it is. Ideally i would get them around mid aug but i'm busy on grouse at that time so like to get them around that busy time 3-4th week june so they are settled down a bit
Also my advice would be dinae start to big it can be quite a lot of work and big financial outlay for even 200 pheas, u will prob have more enjoyment having a couple of informal days with ur mates and dogs and learn as u go rather than putting the pressure off bag numbers/let days and high expectations on u atleast till u learn the ropes and the ground.
Thoose of u who favour Ex-layers How do u get ur returns any tricks to holding them?
The only shoot i know which had any success kept them in a roofed pheasant pen for a good while and basically treated them like poults walking them back to pen and dogging in later on, it also helped they shot both sides off an upland valley with no neighbours so birds would have to wander a long way over cold open hills to find feed and roosting cover. They could probably jist turn the birds out off crates and they would still show a decent return