Makers proof marks on slugs?

dewcrew8 · January 17, 2015, 05:17 PM

When did they stop putting them on slugs? Was going though some of my old Gi ball ammo 45acp . and on some of my rem-umc 1918,1919 they had cracked cases and I pulled the slugs and there Is a (U) on them.

dahermit · January 17, 2015, 06:21 PM

What is a "puff mark"?

dewcrew8 · January 17, 2015, 06:50 PM

sorry proof marks.

Snyper · January 18, 2015, 12:29 AM

A "proof mark" is a stamp applied by an inspector after a gun has passed a "proof test" by firing an extremely high pressure load.

http://en.wikipedia.org/wiki/Proof_test

What you are seeing on those bullets is more likely an identifying "trademark" of the Union Metallic Cartridge Co. (UMC)

There's little reason to mark each bullet, and more trouble to make the dies that way, so I imagine they just stopped to save money

January 17, 2015, 05:17 PM	#1
dewcrew8 Senior Member Join Date: August 7, 2009 Posts: 214	Makers proof marks on slugs? When did they stop putting them on slugs? Was going though some of my old Gi ball ammo 45acp . and on some of my rem-umc 1918,1919 they had cracked cases and I pulled the slugs and there Is a (U) on them. Last edited by dewcrew8; January 17, 2015 at 06:50 PM.

January 18, 2015, 12:29 AM	#4
Snyper Senior Member Join Date: December 16, 2013 Location: Eastern NC Posts: 3,047	A "proof mark" is a stamp applied by an inspector after a gun has passed a "proof test" by firing an extremely high pressure load. http://en.wikipedia.org/wiki/Proof_test What you are seeing on those bullets is more likely an identifying "trademark" of the Union Metallic Cartridge Co. (UMC) There's little reason to mark each bullet, and more trouble to make the dies that way, so I imagine they just stopped to save money __________________ One shot, one kill

January 17, 2015, 06:21 PM	#2
dahermit Senior Member Join Date: October 28, 2006 Location: South Central Michigan...near Posts: 6,501	What is a "puff mark"?