I have tried the experiment some hundreds of times with guns of all descriptions, both with a rest and from the shoulder, and standing as firm as possible; by turning quickly round, and firing (as we might do were a bird to spring in a situation where we could only get a snap shot) against targets such as are used in military ball-practice, being about six feet high, and by means of which one can perceive where the body of the shot had struck. I have also fired against the steep sides of sand-banks, on which, from their smoothness, you can tell every shot that has struck them. My conviction is, that almost all guns charged (as is the custom) with heavy charges of shot, droop full twelve inches in forty yards; though by using small charges of shot you will find them to be thrown much more correctly than the heavy charges; so that it is possible to make a gun too high on the rib for a shooter who thinks more powder and less lead preferable to much lead and little powder. The elevation I have given will be found to be as near what is requisite as possible, if we continue to load as heretofore; if reduced charges of shot be adopted, a less elevation will suffice. To ascertain what elevation at the breech for the above scale is requisite, take the thickness of the breech and muzzle, and multiply the difference by as many times as there are lengths of your barrels in the forty yards, and you will then ascertain what elevation they give of themselves; and to make up the difference wanted, must be the elevation of the rib, which may be calculated in the same way as the barrels; the length of the barrels being the only way of obtaining a correct idea of the height required. If making woodcock guns, less elevation is required, the distance of shooting being shorter. In large guns a greater elevation is necessary. We believe, however, Colonel Hawker has fallen into an error, when he says that long guns require a greater elevation than short ones. Does not a long gun keep the shot more together? Is not more force generated? and is not the initial velocity greater than in a short gun? If these be facts, why is more elevation required if the shot do not droop? We apprehend the Colonel means, if the same height be required to be given above the mark. Nothing can be plainer than this--that if one pair of barrels be four inches longer than another, and the elevation the same, there cannot be as many lengths in the forty yards of the longer barrels as of the shorter, and hence the difference when multiplied. I think, therefore, he cannot have taken into consideration the superiority in their shooting; for there cannot be a doubt that, if a gun keep the shot together longer, it cannot require that allowance for drooping which a shorter gun does.