Interesting thread, found on another forum.
Even if this commentary was envisioning a full sized horn and not the small horns we envision, it is certainly a period reference to priming horns and the concept of carrying a separate horn filled with a finer grade of powder specifically intended for priming.
So I say, so much for priming horns not being period. They may have been rare, but the concept was known to be advantageous prior to this date...
FOLLOWING IS THE INFO PULLED FROM THE OTHER FORUM.
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From: Small Arms of the British Forces in America, 1664-1815, by Dr. De Witt Bailey
Chapter 18, Pages 260 – 261
One of the earliest specific references to a “priming horn” occurs in the description written by George Scott, the ranger captain, concerning a unit which he wished to raise, cloth and arm according to his ideas. It is more intriguing because we do not know whether he was ever able to fully achieve his outfitting goals, thanks to the logistic limitations in America, although he certainly continued to lead ranger units. In writing to Lord Loudoun in 1758, Scott describes the priming horn:
[Captain Scott wrote the following:]
“The priming-horn is intended to be filled with Pistol Powder, and the Ranger always to prime from it in time of action, by which method he will not be near so subject to burn priming or miss fire as He would by priming from a Cartridge, as the grain of the powder will be small and a very great fault which Men are subject to in time of action will be prevented, Vizt. That of spilling one half of their Cartridge of powder and sometimes more in priming and shutting their Pans, and when they have loaded and discharg’d their Pieces after the common method, it often happens that the Ball is not sent with half the force it is intended or anything near the distance it ought to go, which mistake will (I imagine) be avoided by the handiness of the Priming-horn, as the Men will have nothing more to do with the Cartridge than bite off the top, put it in the barrel at once and ram it down, and if the Cartridge is fill’d with Cannon powder it will have just the same effect I conceive as if fill’d with Pistol powder which will get into the touch-hole and catch fire as quick as can be wished…..” 21
End Note 21 from page 366: HL, LO6927, 13 Feb. 1758