The time has not yet arrived for us to have a smokeless powder as regular in its action and as little affected by heat as black powder was, neither have we as free an igniting powder, which is of less moment.
Nitro powders have greatly improved of recent years, and would doubtless have continued the progress, but they have been brought up, and to a standstill, in the last two or three years by a sort of trade agreement, or an invention of “standard” loading, which may be supposed to have had its origin in the wholesale cartridge trade, since it is impossible that it can be good for sportsmen, or for those who try to fit shooters with their personal requirements, or, in other words, try to load a sportsman’s gun according to the individual requirements of gun and man.
We are still in the dark ages of “pressure” testing, or trying the strength of powders by the work they do upon plugs inserted through the walls of testing guns, and, outside, in contact with lead or other metal that the explosion, in moving the plugs, crushes. In doing this the powder-gas does “work” which would be correctly measurable in foot-tons, but is supposed to be measured in static pounds, which is similar to dropping a weight upon a scale balance and mistaking the weight for the work done by the drop. For instance, if we drop a pound weight a foot on to a scale balance, the work it does is equal to one foot-pound. But if we place it on the scale gently, it will just balance one pound on the other side. One is weight and the other is energy, which are not comparative terms. Yet in testing powders the fashion is to take the measure of some unknown proportion of the energy and to call it static pounds.
On the other hand, the fashion is to make the exactly contrary mistake in testing guns for shooting strength. The flattening of the shot pellets on a steel plate is the result of energy; here the flattening of lead by which “pressures” are erroneously taken is ignored and scouted, and velocity is considered the thing to judge by, although it is only the velocity of one pellet out of three hundred which, at 20 yards, vary by as much as 300 foot-seconds mean velocity.
In a lecture delivered by the late Mr. Griffith, of Schultze Company fame, it was said quite truly, and with proper pride, that the velocity of shot had increased during the last twenty years by 100 feet per second at 40 yards. During this time recoil has been reduced very much, only apparently in defiance of the law that action and reaction are equal and opposite.
Recoil is equal to the total momentum of shot, wads, and powder-gas, and what the powder people have done is to reduce that portion of recoil that was not represented by momentum of the shot, but was represented by the momentum of waste powder-gas.
Consequently, what has been got rid of in twenty years is some momentum of powder-gas, which has served two purposes—first, by permitting some extra strength of powder, to put some extra momentum into the shot pellets, and to somewhat reduce recoil in spite of this. That then was the tendency of the powder-makers, when suddenly they were brought to a standstill by a catchword, “standard” loading and “standard velocity.”
There would have been some sense in “standard velocities,” had it been impossible to increase velocities without also increasing recoil; but nobody believes that. The tendency has not only been the other way, but it represents the one and only great improvement in powders that has been made since nitro propellers were first invented. There is still a large proportion of recoil due to the “blast” after the shot has gone, or the momentum of lost powder-gas. It is not nearly abolished, and is only reduced. Consequently, it was no time to say, “Now we have arrived at perfection, and beyond this point it is a fault to go, and consequently we fix as a standard 1050 foot-seconds mean velocity at 20 yards as the correct velocity, above and below which nobody must attempt to carry ballistics of shot guns.” That may suit wholesale manufacturers, because it is a standard easy to accomplish in bulk, but here is what it means as a check to progress.
First, if we take a peep at Mr. Griffith’s own celebrated revolving target trials of just twenty years ago, we find that his mean velocities of those trials were all more than 1050 foot-seconds at 20 yards range. They were for the three guns and loads used 1073, 1124, and 1062 foot-seconds. But he has quite truly told us that during these twenty years the velocity has increased 100 feet per second. Consequently, the “standard loading” sets back the clock more than 100 foot-seconds and more than twenty years. That is not all: those beautiful trials exhibited the fact that the last pellets in a load had from 221 to 300 foot-seconds less mean velocity than the first, so that “standard” loading may mean 1050 foot-seconds for the first pellets, and 750 foot-seconds for the last, at 20 yards range. These trials were all conducted with cartridges loaded with 1⅛ oz. of shot. But years before that, when fine grain black powder was used, and gave to 1⅛ oz. of shot much higher velocities than those named above, Sir Fred. Milbank shot his 728 grouse in the day with ⅞ oz., on the ground that the ordinary 1⅛ oz. gave too little penetration—that is, too little velocity.
The only possible arguments left to put forward against increase of velocity are two:—