modified or cylinder - get both and try them out
Full choke for all buck shot.
You will have to experiment to find out.
Would not recommend using a full choke or even a 20 gauge, 12s are much better
improved cylinder
50m or so
The Short answer is yes. Even in a 410 gauge shotgun with a full choke. Remember that a "410" is 41 caliber or .41 inches in diameter. oo buckshot is only about .32 inches in diameter. The same is true for shooting slugs in a shotgun. There is no safety issue involved. You will notice that there is no warning on the packaging of the ammunition. In our litigious times you can be sure that if there was a problem there would be a warning printed on the box.
It all depends no what you are shooting. You can find many websites that discuss chokes and the applications of which is best for what type of shooting you are doing.
Yes
Depends on the BA, distance, type of buckshot, load velocity.
Yes.
No risk if it's a modern gun in good condition with a shell of the proper gauge. I wouldn't try in damascus barrels or guns with a "poly choke".
Yes