" While the 10 gauge won't extend range, it does allow for a heavier shot charge--useful on larger bodied game." yes,, very much so.. the 20, 12, and 10 have very little in common in my view.. .. when the weather gets cold, the powder gets slow, and the plumage get thick the 10 will be the way to go on geese.. the 10 will be much heaveir if build right, and usually is used in a blind.. the 12 would be for jump hunting,or pheasants, and could be used for geese.. , and the 20 would be good for pheasant and upland birds, and an occasional duck.... this is a rule of thumb.. to go after geese with a 20 is pretty riduculous with out lead shot, even with lead shot its not fair to the animal.. once you get out to 30 yards your not going to have enought density for consistent wing shots with any gun with cylinder bore.. at this point you will need a body shot and be able to pennetrate, the butt feathers, break the hip, or pennetrate the gut to the vitals such as the lungs, heart or even the breast muscles to bring them down.. my 16 does fine for ducks, but a choked 12 is minumum for geese in my book,(or cyldinder bore if you can get close with decoys).. when it comes to ball lyman steel moulds are my favorite as they are round and have a spru cutoff. the smaller calibers have more sizes to try, the bigger bores your at the mercy of chance that youll get a good fit, my opinion only..... another point.. single gun kits with one barrel outside diameter, and several gauges will have the reverse of weight effect... that is the 12 will be heavier than the 10 which isnt correct in my way of thinking.. but one of them will be the correct weight for the load, game, and situation your planning on using.. the weight also includes the weight of the stocks variations.. jim will tell you the parts weight at the shop there, so you can build a gun of caliber and wieght you need.. a goose gun should be heavey as it will be in the pit with a heavy load.. the 12 and 11 gauge will be more of an all around gun.. when i tried maximum loads in my caballas sxs 10 ga i stopped at 165 grains 2f and one ounce and half of lead.. believe me that kicked.. black powder can and will sometimes kick more than modern guns becouse the weight of the powder is added to the charge upon ignition.... my point is dont get too heavey of a 12 or too light of a 10.. 11 guage could be all around compliment to the 20 if itis not too light or too heavy... dont know for sure ive never shot one.. you can take a rasp to the stock of a gun is too heavey but eventually if you keep going your butt is going to be too light to conteract the long barrel,and it wont pull up right.. i dont meant to make you loose any sleep, but id just ask jim which one balances right in his customers views that have bought them.. and that one may not be in stock this time of year.. good luck dave..