I disagree. They are a much more relaxed meat and do have a different flavor than same day killed birds. We lay ours on a concrete floor in an enclosed quansit barn. We clean the day before we leave the weeks kill. You can tell the difference when you eat them for sure.
Have owned numerous A5s. Never had one jam in 50 years. Rings have to match loads and thats where those kind of things happen. But I never coated the tube with a lot of oil. Was always told to spray it with Rem oil or equivalent and wipe off with oil rag. Never a jam. 12s 16s and 20s. Never ever...
I would say most states would be the same. As long as you went through a CO and the person leaving has his license in order. Why would it be a problem. You couldnt write your own note because you would need a extra license.
5s. By far. Im assuming pointing dogs? If not then bismuth would work betyer. But you will never need 3 inch for pheasant. Been hunting them 30 yrs, and nope never.