{"id":12058,"date":"2025-08-17T13:39:52","date_gmt":"2025-08-17T18:39:52","guid":{"rendered":"https:\/\/aaronnewcomer.com\/?p=12058"},"modified":"2025-08-20T11:30:45","modified_gmt":"2025-08-20T16:30:45","slug":"the-davoust-shot-concentrator-a-french-answer-to-unruly-patterns-1855-1859","status":"publish","type":"post","link":"https:\/\/aaronnewcomer.com\/fr\/the-davoust-shot-concentrator-a-french-answer-to-unruly-patterns-1855-1859\/","title":{"rendered":"The Davoust Shot Concentrator: A French Answer to Unruly Patterns (1855\u20131859)"},"content":{"rendered":"

Nineteenth\u2011century hunters wrestled with two maddening behaviors from smoothbore shotguns: at one extreme, tightly packed pellets that flew out \u201clike a ball\u201d (the coup de balle<\/em>), and at the other, errant flyers that blew patterns wide open. Period writers traced both to how the wad pressed or failed to press the shot during ignition: over\u2011compression could keep the column clumped for several yards after the muzzle, while under\u2011compression let pellets collide, deform, and veer off\u2011axis. <\/p>\n\n\n\n

Pierre\u2011Fran\u00e7ois Davoust, an armurier from Alen\u00e7on, set out to cure both problems at once.<\/p>\n\n\n\n

\"A\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button>
A period box of Davoust
long-range<\/em> cartridges, designed to hold together \u2018like a ball\u2019 out to 15\u201316 meters before opening. The packaging illustrates the simple method of loading: pour the powder, insert the cartridge, and fire.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n

What Davoust built<\/h3>\n\n\n\n

Davoust\u2019s cartouche \u00e0 projectiles divis\u00e9s<\/em> was a self\u2011contained shot cartridge that left the barrel intact and then opened in flight. Contemporary descriptions outline a three\u2011part cylinder:
(1) a thin compartment with a \u201cwhite dust\u201d spacer to isolate the powder;
(2) a spongy wad ending in a small conducteur<\/em> that deploys immediately outside the muzzle; and
(3) a paper shot cup capped and held by elastic binding.
The conductor keeps the cartridge on line for the first ~10\u201312 meters, after which the cup sheds and the shot spreads evenly without pellet\u2011to\u2011pellet battering.<\/p>\n\n\n

\n
\"Engraved\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button>
An 1867 article illustrated how the Davoust cartridge left the barrel intact, then opened in flight to release the shot in a controlled pattern.<\/figcaption><\/figure><\/div>\n\n\n

Davoust\u2019s patent literature renders the same idea mechanically: a fabric disc and string form a parachute\u2011like conducteur<\/em>; the shot cup opens beyond the muzzle roughly at 12 meters. The cartridge was designed both for ramrod loading and, with a simple adaptation, for the new breechloading douilles.<\/p>\n\n\n\n

How it was used<\/h3>\n\n\n\n

Loading was intentionally simple: pour the powder, then slide the whole Davoust cartridge above it, no separate wads for powder or shot. Writers in Journal des Chasseurs<\/em> even remarked that, for a conventional muzzle\u2011loader, it was as fast as dropping a cartridge into a Lefaucheux breechloader and often quicker than dealing with a Beringer after\u2011shot extraction.<\/p>\n\n\n\n

\"An\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button>
An open box of Davoust
petite port\u00e9e<\/em> cartridges, the short-range version that began to open at just 4\u20135 meters from the muzzle. Mesh conductors, shot, and case parts can also be seen, giving a rare glimpse at the system as hunters would have encountered it.<\/figcaption><\/figure>\n\n\n\n

Davoust marketed two versions. The petite port\u00e9e<\/em> began to open at roughly 4\u20135 meters from the muzzle which wasgood for early season and woods shoots as well as the long\u2011range variant which held together \u201clike a ball\u201d out to about 15\u201316 meters before releasing, a better fit for late\u2011season fields, marsh, and driven days.<\/p>\n\n\n\n

What period testers claimed<\/h3>\n\n\n\n

Period trials credited the Davoust cartridge with roughly double the penetration of an ordinary charge of equal powder, an effect attributed to better gas sealing and more efficient use of the propellant.<\/p>\n\n\n\n

They also reported an eye-catching safety observation: with Davoust cartridges seated above, but not touching, the powder, experimenters fired hundreds of rounds and even plugged the muzzle with earth without bursting the barrel. Repeating the \u2018plugged muzzle\u2019 test with a normal load split the tube. The magazine printed this without a firm physical explanation, but presented it as a consistent experimental result.<\/p>\n\n\n\n

Two drawbacks were noted: cost (adding 5\u20136 centimes per shot) and early heat-related failures of the rubber cap that could dump the shot, an issue Davoust addressed with stronger closures and, if needed, a gauge-sized wad that would still retain pellets even if the elastic failed.<\/p>\n\n\n\n

Evolution under patent<\/h3>\n\n\n\n

Davoust filed a 15\u2011year patent on 25 April 1855, then iterated steadily. Certificates of addition in 1856\u20131857 refined the mouth geometry of the shot cup (flared for quicker release, constricted for longer hold), described the parachute conductor and its string, and detailed a version whose cup splits lengthwise so it opens as soon as it clears the muzzle which was useful for the petite port\u00e9e<\/em> behavior.<\/p>\n\n\n\n

\"Patent\n\t\t\t\n\t\t\t\t\n\t\t\t<\/svg>\n\t\t<\/button>
Detail from Davoust\u2019s French patent showing the conductor and cylindrical shot cup, an early attempt to regulate shot patterns long before plastic wads. Credit: French Patent & Trademark Office (INPI)<\/figcaption><\/figure>\n\n\n\n

A later 1859 certificate even replaced the rubber binding with heavy thread: three external ties braced the long\u2011range model from cap to sabot, then passed through the wad, yet another attempt to make the closure more heat\u2011proof in heavy use.<\/p>\n\n\n\n

Why it mattered<\/h3>\n\n\n\n

The Davoust cartridge was part of a broader mid-century push to tame shot patterns for specific game and distances. By delaying pellet release in a controlled, repeatable way, and by making the whole process quick to load for both muzzle-loading and breech-loading guns, Davoust gave hunters a practical \u2018concentrator\u2019 years before plastic shot cups and modern wads standardized the idea. Period writers, including Baron du Casse, went so far as to dub it \u2018universal\u2019 after London demonstrations, an enthusiastic label that captures how novel the concept felt in the late 1850s.<\/p>\n\n\n\n

R\u00e9f\u00e9rences<\/h3>\n\n\n\n

Journal des Chasseurs<\/em>. \u201cLa Cartouche Davoust.\u201d Vol. 22, 2nd Semester, 1858, pp. 244\u2013247.<\/p>\n\n\n\n

Description des machines et proc\u00e9d\u00e9s sp\u00e9cifi\u00e9s dans les brevets d\u2019invention, sous le r\u00e9gime de la loi du 5 juillet 1844.<\/em> Tome XLIX. Paris: Imprimerie Imp\u00e9riale, 1855\u20131859. Patent no. 13653 (Davoust, 25 April 1855) and certificates of addition, 1856\u20131859.<\/p>\n\n\n\n

La Chasse Illustr\u00e9e<\/em>. \u201cLa Cartouche Davoust.\u201d Premi\u00e8re ann\u00e9e, no. 22, 28 d\u00e9cembre 1867, p. 176.<\/p>","protected":false},"excerpt":{"rendered":"

Nineteenth-century hunters faced challenges with smoothbore shotguns’ performance due to wad issues. Pierre\u2011Fran\u00e7ois Davoust developed an innovative self-contained shot cartridge, enabling better shot dispersion and safer firing. His design improved penetration and reduced loading time, influencing hunting techniques and marking a significant advance before modern ammunition.<\/p>","protected":false},"author":1,"featured_media":12059,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","wprm-recipe-roundup-name":"","wprm-recipe-roundup-description":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"enabled":false,"token":"eyJpbWciOiJodHRwczpcL1wvYWFyb25uZXdjb21lci5jb21cL3dwLWNvbnRlbnRcL3VwbG9hZHNcLzIwMjVcLzA4XC9kYXZvdXN0LTEwMjR4NjgzLmpwZyIsInR4dCI6IlRoZSBEYXZvdXN0IFNob3QgQ29uY2VudHJhdG9yOiBBIEZyZW5jaCBBbnN3ZXIgdG8gVW5ydWx5IFBhdHRlcm5zICgxODU1XHUyMDEzMTg1OSkiLCJ0ZW1wbGF0ZSI6ImhpZ2h3YXkiLCJmb250IjoiIiwiYmxvZ19pZCI6MTU1NDA5MTUzfQ.Qqk39UMLI6EfmVy1iTcUCNdC3DfDnA5fRN02B8EdIA8MQ"},"version":2}},"categories":[160],"tags":[],"class_list":["post-12058","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ammunition"],"yoast_head":"\nThe Davoust Shot Concentrator: A French Answer to Unruly Patterns (1855\u20131859)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aaronnewcomer.com\/fr\/the-davoust-shot-concentrator-a-french-answer-to-unruly-patterns-1855-1859\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Davoust Shot Concentrator: A French Answer to Unruly Patterns (1855\u20131859)\" \/>\n<meta property=\"og:description\" content=\"Nineteenth-century hunters faced challenges with smoothbore shotguns' performance due to wad issues. 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Newcomer","author_link":"https:\/\/aaronnewcomer.com\/fr\/author\/aaronn322\/"},"uagb_comment_info":7,"uagb_excerpt":"Nineteenth-century hunters faced challenges with smoothbore shotguns' performance due to wad issues. 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