How old are these cases?

[lpreddick]

I luckily found some really old Rem-UMC headstamped 222 Rem brass in original red boxes. Rem's address did not have a zip code. Zip codes were started in 1963. When did Rem-UMC head stamps cease? Thes cases were greenish but were very shiney after a few hours in tumbler. Weight variation was very small, better than Lapua! I annealed them and shot some with light loads in my modified 222 that gets 3550 fps with 52 gr bullets using LT 30. A few Lapuas have loosen their primer pockets after 3-4 firings. Crappy(being kind) Norma 222 Rem brass blows primers after 2 firings. These case were shot hotter and primer pockets a still very tight. I have some jewels! The zip code makes them 55 years old, so how much older are the y?

 

[Dans40X]

60's vintage Remington Union Metallic Cartridge brass was shipped PRIMED in a red/white/green striped box of 20 pieces.

I have 16 boxes of various caliber Rem-UMC virgin brass in the 20rd boxes stored in a sealed container as show & tell memorabilia.

 

[retired]

gee you do not suppose you are over loading the 222.
western says you are 500 fps faster than their max load.
they did stop at 50k, but you are way beyond.
normally primer pockets that so not last are an education tool.
the load is too hot. you are at my 223 with a 26" bbl

 

[lpreddick]

gee you do not suppose you are over loading the 222.
western says you are 500 fps faster than their max load.
they did stop at 50k, but you are way beyond.
normally primer pockets that so not last are an education tool.
the load is too hot. you are at my 223 with a 26" bbl

My 222 is modified. JGS reamer with shoulder moved forward. Shoulder angle to 30° and all but .010" taper removed from the case. These changes add 2.2 + gr propellant, esp small kernals like LT 30 and Norma 200. I wanted to increase speed from this case and maintain it's accuracy. Both of these objectives were met.

 

[243winxb]

1950 to 1970 ? My guess.

1946-1960
1: BOXES TYPE: 1 PIECE WITH END FLAPS, THUMB CUTS AND SLIDE OUT TRAY

2: BOX COLORS: GREEN AND RED. “KLEANBORE” WITH “REMINGTON” IN A RED
CIRCLE & “DuPONT” IN AN OVAL
3: LOAD INDEX NUMBERS: VERTICAL ON LOWER RIGHT CORNER
STYLE “XXXX”. EXAMPLES: 5138 or 6645
FIRST TWO NUMBERS ARE THE LOAD TYPE
LAST TWO NUMBERS ARE THE CALIBER
4: COMPANY NAME:
REMINGTON ARMS CO., Inc.
BRIDGEPORT, CONN.

The Union Metallic Cartridge Company (UMC) was an early manufacturer of cartridge ammunition for small arms. The company was founded in 1867 during the most rapid evolution of cartridge design to date.[1] Following merger with Remington Arms in 1912, the company manufacturing complex in Bridgeport, Connecticut became a major arms supplier during World War I. The factory was Remington headquarters until 1984 and the source of sporting and police ammunition headstamped REM-UMC until 1970.

https://en.m.wikipedia.org/wiki/Union_Metallic_Cartridge_Company

 

[jds holler]

It used to be believed that Rem/UMC brass was thicker than most other brands, as was military brass. And that case capacity/pressure needed to be adjusted accordingly. I don't know if that was true of all cartridges or not. I have always refrained from mixing Rem and Win. with the same loads. Anyone care to elaborate? jd