The circumftance of a duck-gun killing at a greater diftance than a fowling piece, is not owing to its length, but to its- greater weight and thicknefs allowing the charge of powder to be doubled, trebled, or even quadrupled, which cannot be done in a fowling piece though ftrongly reinforced. For a barrel of five or fix feet, fuch as that of a common duck-gun, weighing five or fix pounds, and the whole piece twelve or thirteen pounds ; may be fired with a very large charge, without recoiling fo much as to hurt the fhooter, its weight being fufecient to refift the violent impulfe occafioned by the in- creafe of the powder. But in a fowling piece of three feet barrel, fufeciently ftrong to withftand fuch a charge, and whofe weight altogether does not exceed five or fix pounds, the recoil would be infupportable. Be- fides, they not only double or treble the powder in a duck-gun, but they put in a much greater quantity of fhot than is ever employed in a fowling piece*. * Duck-guns are generally bent a little upwards near the muzzle, which, the gunfmiths fay, makes them throw their fhot farther than if they were per fectly ftraight. To obtain, therefore, from a piece of the ordinary length, the fame effects as from a duck-gun, nothing more, perhaps, is necefsary than to have the barrel fufficiently ftrong to admit of the charge being doubled or trebled as required, and the whole piece heavy enough to render the recoil fupport- able. We may here obferve, however, that an increase of the powder above the charge generally ufed, does not pro duce a proportional increafe of range in the ball or not: thus a double charge of powder will not throw the, ball or fhot to twice the diftance, nor a treble charge to three times the diftance, the fingle charge does. This arifes from the great refiftance given by the air to the motion of the ball or fhot, and which is proved to be fourfold if the velocity be doubled, and ninefold when it is trebled by an increafe of the powder. So great is the change in opinion of late, with regard to the proper length for gun barrels, that many gunfmiths will now tell us, that fhort barrels carry farther than long ones ; and the reafon they give for this, is, the greater friction of the ball or fhot in pafling through a long barrel, by which their velocity is retarded and their force diminifhed. If the barrel be fo long that the additional impulfe which the ball or fhot is continually receiving in its paffage, becomes lefs than the friction between them and the fides of the caliber, then, indeed, the barrel by being fhortened will fhoot with more force : but as the length of barrel required to produce this effect, is vaftly greater than can ever be employed for any purpofe, the objection does not Having now, we hope, thrown every light upon this queftion, that is necef- fary to determine us in our choice of the length, it will, perhaps, be expected, that we give our opinion, what length of barrel is beft calculated for general ufe. The barrels which we ourfelves employ, and which we have found to anfwer beft for every pur- pofe, are from 32 to 38 inches; and whether we confult the appearance of the piece, its lightnefs, or the eafe with which it is managed, we believe that a barrel not exceeding the one, or below the other of thefe numbers, is the moft eligible.
AN ESSAY ON SHOOTING 1789