Jerry & Chuck,
My original post on this subject was in answer to the original question "what is your opinion on opening my choke from F&F?"
My reply was advice to consider Half(Mod)& Three Quarter (IM)based upon my Field experience and scientific tests.
My Field experience encompasses mainly, Driven High Pheasant, Wildfowling, and Pigeon Shooting.
The scientific research I mentioned is based upon my interpretation of research which is ongoing by BASC in conjunction with CONSEP which is available on line by going to the relative organisations websites.Obviously we all know that in any debate numbers can be crunched to favour either side of the argument.
Back to the plot.
It is my fervent belief that it is better to have adequate patterns to ensure the humane despatch of any quarry I shoot at.
There is no doubt that if you put enough pellets from True Cylinder into your quarry you will despatch it but the real problem is accurately judging range, which we have all proven we are generally poor at doing.
If I was Snipe shooting, Quail shooting, Dove, Decoyed Pigeon shooting I would prefer Quarter choke or less.
But with a fixed choke gun for general purpose shooting I would favour Half in both or Three Quarters (IM) in the second barrel.
Indeed originally many fixed choke Continental Game guns featured choking of 1/4 & 3/4 and two Italian guns I have with 1/4 designated choking actually throw patterns nearer half choke.
When we have knowledge and experience, we know wether to take that shot or not based upon the belief we have enough pattern to despatch the retreating bird or not to take the shot at a close bird because of the belief we may damage the meat.

Here is food for thought, In early trials it as been found that out of 100 participants (mainly clay shooters) it was found that under 30% achieved a strike rate of 6 ex 8 at 30 yds.Only 8% succeded at 40yds.
These tests were on a clay crossing at about a height of 12ft 90 degrees to the shooter crossing left to right, level flight, and a report bird right to left.
Also a driven overhead tower bird at 30 yds high and 40 yds high.
Before you scoff, try it, no practicing, 8 shots only, straight in.
Let me know how you get on.
In fact let CONSEP know how you got on.
Good shooting.