Way back in 1960 when I was very young with quick reflexes and fantastic eye hand quardination, I could shoot a
jumped quail, before my Father and his friends could mount their guns. Actually shot one so close the dog would not even retreave the bloody pulp,split up the back and laying on a holly bush,slowly dripping blood.
A 20Ga with a I/C or Mod choke was all that I needed back then................and today for walking the fields and flushing birds
or on a water hole for some doves, you will find a I/C choke in my guns. If going for larger birds like chuckar I will use a Modified since they can run aways before flushing and some shots can be at 40 yards or more.
I have shot 1oz loads of 7 1/2's at 1180 but nothing faster.............but I do know that at 1290 fps the pellets will kill
farther out than most people are able to shoot corretly. I had a friend that shot a chuckar running on the other side of a gully
and 30 yards up the hill,across from where he was standing and the range was around 65 yards. He told me he aimed 6-8 feet in front of the bird !
Two of my favorite guns for the field are a .410 pump and a Auto-5 12Ga but they both have a fixed factory full choke barrel,so I have to let the others shoot first and I get my turn if any thing is still flying at 30 yards or more......................
Yes the I/C choke does have its advantages.