There is a great deal of confusion between marjoram and oregano. They are related plants, but are two different species. They also taste similar, although oregano often has a stronger flavor, and both contain high amounts of antioxidants. To make it even more confusing, cretan oregano, O. onites, is also called French or pot marjoram and Greek oregano, O. vulgare, is often called wild marjoram.
Cylinder choke is an unconstricted barrel. The shot pattern spreads quickly. Improved Cylinder choke has a slight constriction. It allows the shot pattern to spread fairly quickly. This is a good choice for quail, rabbits, and other upland game. Modified choke has moderate constriction. The shot stays together longer, making the pattern denser and more useful at longer ranges. This choke is used often for dove hunting and is the preferred choke when using steel shot to hunt for ducks or geese.
Messages: 4,002. Patern your gun and see which choke gives an acceptable pattern at the yardages you expect to break targets at. Not all chokes peform as marked. I have a Modified that gives a light full pattern and a full choke that gives a Modified pattern, at best. A Modified or Improved Modified PATTERN would do the trick for you at the yardages you mentioned. You can certainly go tighter if you desire to do so. I just shot an Improved Modified choke from well beyond the 27 yard line for the long range games this evening. I was in the money for one and in the top three for the next. A full choke would probably have done no better. The patterns from my full choke tube are very dense in the center but horrible outside the center ten inch circle.