Were these bullets turned on a lathe? Or those scratch marks something else?
Robin Hood Ammunition, Swanton (Vermont). It seems to be like the French ball D, but brass instead bronze. Can you disassemble it with a kinetic hammer?
Hi, Some US bullets (by scovill Man.Co Connecticut) have 3 stages of turning),
I see one pic about building date 1918 certainly on this forum or in IAA Bulletin .
hier it’s perhaps a collector test for cleaning bullet with turning machine …
Balle D are NOT Bronze ( Copper +Tin) ; They are a Brass, ( Copper 90%, Zinc 10%) Incorrectly called
" Manufacturing Bronze"…
The formation of the Balle D is as shown, a combination of double heading, and then turning to eliminate the flash, and cut the crimping cannelure.
Followed by “butt stamping” the boat-tail base with factory ID and year details.
There is a video of a film from 1937 in France, which shows the making of Balle D, as well as the alternate Drilling of Berdan Flash holes in 7,5x54 M24/29 C cases.
I manufacture correct Balle D ( 1897 & 1920s Drawings) by CNC from 60/40 common Brass, giving a Bullet of 194.5 Grains, as against
Original Balle D of 197.5 grains.
The Mass difference is due to the
Density difference of the different alloys. Not that it affects shooting accuracy…at 200 yds, Target Patterns are similar for both. ( Original and CNC).
AVB TechServices, CNC Military Profile Projectiles.
Edit: Correction above: " Copper 90%, Zinc 10%".
Doc, maybe I am misunderstanding.
Brass is an alloy of copper and zinc (till to 50/50)
Bronze is an alloy of copper and tin (max 72/28).
I swear I was convinced that the French D balls were made of bronze
Hi, officiel document 1901.
So Brass (90 c,10z)
I like this thing that you never stop learning.
Thanks to both of you
The confusion seems to originate in terminology used in the U.S. copper industry.
Military specification MIL-C-21768A of 1971 says that copper alloy 220, containing 90 percent copper and 10 percent zinc (obviously a brass alloy) is also called “commercial bronze”.
I am relieved that copper alloy 210 (brass with 95 percent copper) is called “gilding” as expected.
Hi, in french we often use current term “Tombac” for this bullet métal.
The same in German: “Tombak” for English gilding.
Actually, Tombac/k is a Javanese word, imported into Dutch, ( 1600s) and then spread throughout Europe to describe a reddish Brass used for making kitchen utensils etc, and eventually Bullet Jackets replacing the more expensive Cupro-Nickel
( “German silver” or “Pinchbeck”) which also caused high rates of Nickel Fouling in Rifle Barrels.