Great Article

Certainly packed full of info ... but "dated".

With references to No. 5 (lead) shot for ducks and no mention of interchangeable chokes, steel shot, or Sporting Clays for instance, I'd say the article was written sometime before 1985.
 
Extra Barrels or Variable Choke

By referring to the chart it will be noted that the same gun can be used on various game under varying conditions by changing from one barrel to another of different choke and length. On all Browning automatic shotguns, barrels of the same gauge and model are readily interchangeable. Thus a duck gun can become a skeet gun, or a fine upland game gun, by changing barrels.

Versatility of a gun can also be increased by having one of the several good variable choke devices installed on the end of the barrel. Such a device permits the shooter to switch from one choke to another as shooting conditions require. The resulting patterns, although possibly not quite as good, approximate the desired choke for most purposes. However, one should expect the balance of his gun to be slightly upset because of the added weight of the choking device. It is popular today to use screw in chokes. By simply changing the tube at the end of the barrel , you can carry all the different chokes in one pocket.

were interchangeable chokes introduced in 1985? It does make reference to taking your gun and getting a choking device installed, cool. It still explains skeet/trap well!
 
" variable choke device " sounds to me something like the PolyChoke or Cutts,
a device added to the barrel like that found on the old Mossberg's.

The first internal "interchangeable" chokes I recall running into were on the
1976 Perazzi MT-6's. Winchester followed along soon after with the "Winchoke".
 
Which company was it that used to advertise a self setting choke. Their claim was that you could set one degree of choke for the first shot and it would reset itself to give a tighter pattern on the second shot.
 
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