Quail, 7/8 or 1 oz of #7-1/2 (or #6) with IC and Mod in 20 ga.
Sometimes use the 16 ga with the same shot size and chokes.
Last two years it’s mainly the 28 ga auto with a Mod choke for chukar and Sharptail grouse with a 7/8 oz reload of #6 shot. Would have shot California quail with the same combo but didn’t get into any on the two days we hunted them, combo with Huns and chukars. Was a poor bird year there.
Over the dog, 8's in the loose tube and 6's in the tighter one for chucks... both 8-7.5's for quali. I have a bunch of SxS guns so chokes vary a bit. Most are IC/mod.
My poor shooting at chukar is completely independent of the loads I choose, unfortunately. However, I like a modified or even full choke if they are being flighty to hopefully extend my range
Usually, quail will see me using 28ga 3/4oz of #8's with a Skeet and IC choke. Chukar usually 28ga 3/4oz of #7.5's with a IC and Modified choke.
Every now and then I'll break out the 20ga using the same choke and loads but with 7/8oz.
For quail, I like #7.5 shot, 1oz loads in 20ga. For whatever reason, 1oz loads are harder to find, but I much prefer them. As for Chokes, IC & Modified paired together if I'm shooting an over-under. If I'm shooting a semi-auto, I almost always run an IC for most everything. I'll go to a modified if I'm hunting spooky pheasants that like to bust way out in front of the dog.
I just shoot #5 for all upland birds. Perfect combo of knockdown power out to 50 yds and pellet density. I pattern my loads for my Franchi Affinity 12ga, modified choke (it's an extended choke I can't remember which brand, but I've had it for 10 years). I'll be shooting some roosters this weekend and some chukar in UT in 2 weeks.
Quail/pheasant/chukar I like #6 through ic/mod, they’re a tougher bird to me. Grouse #7.5 skt/ic usually up close and personal. Dove #7.5 or 8 mod/full if they don’t want to decoy that full choke helps reach out there a bit when pass shooting. If they’re really being shy the full with #6 will reach out and connect, great for big shoots on large fields. I run a 20ga for everything but ducks, I’ll be trying the 28 this year on upland.
Lots of variables. Two different birds, two different needs.
The best quail loads I've used were the 1 oz 7 1/2, 12 gauge WW/AA's @ 1350 fps. Impact velocity makes a big difference. Choke depends on whatever you can hit with. One ounce loads tend to pattern fairly tight.
Chukar are bigger and depending on how well they hold, makes a big difference on what load a person uses. My standard Chukar load isn't what most would consider ideal. I never patterned it, (but I will) think it was pretty bad. Sure killed a lot of birds. 1 1/8 oz number 7 @ 1565 fps. Browning invector plus improved modified choke. If I were start from scratch with a new load. it's be your basic 1 1/4 oz of 6's @ 1330 fps.. I would take the time to shoot it at paper.