the 16 came about many wars ago when the 20 gauge ball was not big enough, and the 12 and bess (.750 )was huge.. the french used the 16 flint for many years with success.. the 16 carried its popularity in europe when the shotguns were cylinder bore side by sides. greener had pattern contests listed in his book that were the big thing of shotgunners of the day.. i cant remember but i think alot used 12 gauge. it may be interesting to note that the best african llion stoppong gun at the time was a sxs with 12 guage ball.. the quality 16s were always very light, my drilling is the same weight of a lot of modern 16s and it has an extra barrel, about 7- 7 1/2 pounds.. as the shot column gets smaller more shot is on the edge of the barrel and it suffers for it.. now with shot cups that is minimized and could be improved as the plastic may actually be better for shot than the lead next to it.. my hodgdons shotgun manual shows the velocity and 1 1/8 ounce max loads in 16 and 20 mag at the same velocity.. so the 20 and the 16 is in a dead heat for power,..the best part about the 16 is for about `1500 dollars and a whole lot of luck you can get a shotgun that puts modern sxs in the stone age.. im not talking about ejectors, im talking about balance, fit ,beauty, and barrels that shoot very close to right on without appliances added to the stock or top of the barrel such as an elevated rib.. .. its very hard to explain how a 7 pound gun shooting 1 1/8 ounce loads will kick less than a 8 1/2 pound gun with the same shot amount and velocity.. the kick is not less the precived recoil is less becouse of fit, pitch, castoff, etc.. my lefever 12 gets higher scores but it kicks more and slaps my face for some reason.. the 20 mag is a very fine gun tho... oh heck i love them all.. dave..