I use 7.62 x 51 brass, sorted by brand and year. The same as not mixing .308 by brand.
If you start from minimum powder load for developing any load, no worries.
As mentioned, removing the primer crimp is a once off.
Good list (not complete) for brass, to let you watch out for Berdan primers.
Argentine, '83, [ FLB ], Berdan, three star crimp with green primer sealant. Other HS's FM or FS
Australian, '66, [MF ], Berdan, ring crimp with purple primer sealant. MF L2A2
Australian, '70, [MF ], Berdan, ring crimp with purple primer sealant.
Australian, '83, [AFF ], Berdan, ring crimp with purple primer sealant.
Australian, '83, [MF ], Berdan, ring crimp with purple primer sealant.
Australian, '85, [AFF ], Berdan, ring crimp with purple primer sealant.
Australian, '87, [AFF ], Berdan, ring crimp with purple primer sealant.
Australian, '88, [AFF ], Berdan, ring crimp with purple primer sealant.
Australian, '89, [MF ], Berdan, ring crimp with purple primer sealant. MF L2A2
Australian, '90, [AFF ], Berdan, ring crimp with purple primer sealant.
Australian, '91, [AFF ], Boxer, ring crimp with purple primer sealant.
Australian, '92, [ ADI ], Boxer, ring crimp with purple primer sealant.
Austria, '75, [ HP ], Berdan, three star crimp with dark green primer sealant. Other HS's H
Austria, '78, [ HP ], Berdan, three star crimp with no primer sealant visible.
Austria, '79, [ *79* ], Boxer, three star crimp with light green primer sealant.
Austria, '80, [ *80* ], Boxer, three star crimp with light green primer sealant.
Belgium, '64, [ FN ], Berdan, three star crimp with red primer sealant. NATO Cross
Belgium, '77, [ FN ], Berdan, three star crimp with purple primer sealant. NATO Cross
Belgium, '80, [ FNB ], Berdan, three star crimp with purple primer sealant. NATO Cross
Bosnian, '03, [IK], Boxer, ring crimp with bright red primer sealant. 7.62x51 IK
British, '84, [ RG ], Berdan, ring crimp with purple primer sealant. (Radway Green)
British, '85, [ RG ], Berdan, ring crimp with purple primer sealant. NATO Cross
British, '90, [ RG ], Boxer, ring crimp with red primer sealant. NATO Cross
British, '93, [ RG ], Berdan, ring crimp with purple primer sealant. NATO Cross
British, '95, [ RG ], Berdan, ring crimp with purple primer sealant. NATO Cross
Canadian '68, [ IVI ], Boxer, ring crimp with no primer sealant visible. NATO Cross
Canadian '70, [ IVI ], Boxer, ring crimp with no primer sealant visible. NATO Cross
Chile, '73, [ F. ], Berdan, ring crimp with dark green primer sealant. NATO Letters
Chile, '74, [ F. ], Berdan, ring crimp with dark green primer sealant. NATO Letters
Chile, '76, [ F. ], Berdan, ring crimp with dark green primer sealant. NATO Letters
Czechoslovakia, '69, [ ZV ], Berdan, ring crimp with black primer sealant.
Czech Republic, '82, [O O], Berdan, ring crimp with dark red primer sealant.
Denmark, '63, [AMA], Berdan, three star crimp with purple primer sealant. NATO Cross
Denmark, '76, [AMA], Berdan, three star crimp with purple primer sealant.
Denmark, '78, [AMA], Berdan, three star crimp with purple primer sealant.
Denmark, '81, [AMA], Berdan, three star crimp with purple primer sealant.
Denmark, '82, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '83, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '84, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '85, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '86, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '87, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '88, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '91, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '92, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '93, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '95, [AMA], Berdan, three star crimp with green primer sealant.
Denmark, '96, [AMA], Berdan, three star crimp with green primer sealant.
German, '59, [ MEN ], Berdan, three star crimp with no primer sealant visible. NATO Logo
German, '59, [ MS ], Berdan, three star crimp with green primer sealant. NATO Logo
German, '60, [ MS ], Berdan, three star crimp with green primer sealant. NATO Logo
German, '69, [ MEN ], Berdan, three star crimp with green primer sealant. NATO Logo
German, '76, [ DAG ], Boxer, three star crimp with green primer sealant. NATO Logo
German, '88, [ MEN ], Berdan, three star crimp with green primer sealant. NATO Logo
German, '93, [ DAG ], Berdan, three star crimp with green primer sealant. NATO Logo
German, '94, [ MEN ], Berdan, three star crimp with green primer sealant. NATO Logo
Greek, '80, [HXP ], Boxer, three star crimp with green primer sealant. NATO Cross
Indian, '78, [ OFV ], Boxer, ring crimp with no primer sealant visible.
Indian, '93, [ KF ], Boxer, ring crimp with no primer sealant visible.
Indian, '97, [ OFV ], Boxer, ring crimp with no primer sealant visible.
Indonesian, '85, [ PINDAD ], Berdan, three star crimp with green primer sealant.
Israel, '70, [ת צ], ring crimp with red primer sealant visible. month-year
Israel, '71, [ת צ], ring crimp with red primer sealant visible. month-year
Israel, '72, [ת צ], ring crimp with red primer sealant visible. month-year
Israel, '73, [ת צ], ring crimp with red primer sealant visible. month-year
Israel, '74, [ת צ], Boxer, ring crimp with red primer sealant visible. month-year
Israel, '75, [ת צ], Boxer, ring crimp with red primer sealant visible.
Israel, '76, [ת צ], Boxer, ring crimp with red primer sealant visible.
Israel, '84, [IMI], Boxer, ring crimp with purple primer sealant visible.
Lake City, '58, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '63, [ LC Match ], Boxer, zero crimp with red primer sealant. year
Lake City, '64, [ LC MATCH], Boxer, zero crimp with red primer sealant. MATCH LC year M 118
Lake City, '65, [ LC Match ], Boxer, zero crimp with purple primer sealant. MATCH FA year M 118
Lake City, '66, [ LC ], Boxer, ring crimp with purple primer sealant. NATO Cross
Lake City, '66, [ LC MATCH], Boxer, zero crimp with red primer sealant. MATCH LC year M 118
Lake City, '70, [ LC ], Boxer, ring crimp with light red primer sealant. NATO Cross
Lake City, '70, [ LC Match ], Boxer, zero crimp with green primer sealant. MATCH LC year M 118
Lake City, '71, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '81, [ LC Match ], Boxer, zero crimp with purple primer sealant. year
Lake City, '82, [ LC ], Boxer, ring crimp with red primer sealant.
Lake City, '84, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '85, [ LC Match ], Boxer, zero crimp with red primer sealant. year
Lake City, '86, [ LC Match ], Boxer, zero crimp with red primer sealant. MATCH LC year M 852
Lake City, '87, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '88, [ LC Match ], Boxer, zero crimp with red primer sealant. year NATO Cross M 118 SB
Lake City, '88, [ LC Match ], Boxer, zero crimp with red primer sealant. MATCH LC year M 852
Lake City, '89, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '90, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '91, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '91, [ LC MATCH], Boxer, zero crimp with red primer sealant.
Lake City, '94, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '95, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '98, [ LC ], Boxer, ring crimp with red primer sealant. NATO Cross
Lake City, '04, [ LC LR ], Boxer, zero crimp with red primer sealant.
Lithuanian, '03, [ GGG ], Boxer, ring crimp with red primer sealant.
Lithuanian, '04, [ GGG ], Boxer, ring crimp with red primer sealant.
Malaysia, '82, [ MAL ], Berdan, three star crimp with dark red primer sealant. MAL 7.62 4-82
Malaysia, '83, [ MAL ], Berdan, three star crimp with dark red primer sealant. MAL 7.62 5-83
Nigeria, '70, [OFN ], Berdan, three star crimp with dark green primer sealant. O.F.N. 34-70 7.62x51
Pakistan, '79, [ POF ], Berdan, ring crimp with light red primer sealant.
Pakistan, '80, [ POF ], Berdan, ring crimp with light red primer sealant.
Paraguay, '79, [MDRP ], Berdan, ring crimp with light red primer sealant. 7.62x51 79-MDRP (France)
Paraguay, '80, [MDRP ], Boxer, ring crimp with light red primer sealant. 7.62x51 80 MDRP (Israel)
Portuguese, '76, [ FNM ], Berdan, three star crimp with green primer sealant. NATO Cross
Portuguese, '78, [ BF ], Berdan, three star crimp with green primer sealant. NATO Cross
Portuguese, '78, [ FNM ], Berdan, three star crimp with green primer sealant. NATO Cross
Portuguese, '79, [ BF ], Berdan, three star crimp with green primer sealant.
Portuguese, '80, [ BF ], Berdan, three star crimp with green primer sealant. NATO Cross
Portuguese, '81, [ FNM ], Berdan, three star crimp with no primer sealant visible.
Portuguese, '82, [ FNM ], Berdan, three star crimp with no primer sealant visible.
Portuguese, '92, [ FNM ], Berdan, ring crimp with green primer sealant.
Remington, '67, [RA ], Boxer, ring crimp with red primer sealant. NATO Cross
Serbia, '89, [ nny ], Berdan, ring crimp with red/orange primer sealant.
Serbia, '308 WIN, [ nny ], Boxer, ring crimp with red/orange primer sealant. '02
Singapore, '77, [ GG ], Berdan, ring crimp with light green primer sealant. 7.62 XX are dates
Singapore, '86, [ HF ], Berdan, ring crimp with light green primer sealant.
Spain, '80, [ SB ], Berdan, three star crimp with green primer sealant. (Santa Barbra)
South Africa, '77 [ R1M1 ], Berdan, three star crimp with purple primer sealant. 7.62 R1M1 A 77
South Africa, '79 [ R1M1 ], Berdan, three star crimp with purple primer sealant. 7.62 R1M1 A 79
South Africa, '80 [ R1M1 ], Berdan, three star crimp with purple primer sealant. 7.62 R1M1 WA 80
South Africa, '81 [ R1M1 ], Berdan, three star crimp with purple primer sealant. 7.62 R1M1 B 81
South Africa, '84 [ 12 ], Berdan, three star crimp with purple primer sealant. 12 84
South Africa, '98 [ 98 ], Berdan, three star crimp with purple primer sealant. 7.62mm 98 089D98
Sweden, '66, [ SM ], Berdan, three star crimp with green primer sealant.
Sweden, '72, [ 070 ], Berdan, three star crimp with dark purple primer sealant.
Twin Cities, '67, [TW ], Boxer, ring crimp with red primer sealant. NATO Cross
Twin Cities, '69, [TW ], Boxer, ring crimp with red primer sealant. NATO Cross
United States, '64, [WRA], Boxer, ring crimp with red primer sealant. NATO Cross
United States, '66, [WRA], Boxer, ring crimp with red primer sealant. NATO Cross
United States, '86, [WCC], Boxer, ring crimp with red primer sealant.
United States, '05, [FC], Boxer, ring crimp with purple primer sealant. 7.62 NATO Cross
United States, '10, [FC], Boxer, ring crimp with blue primer sealant. 7.62-M1A
United States, '11, [FC], Boxer, ring crimp with blue primer sealant. 7.62-M1A
Venezuelan, '89, [CAVIM ], Berdan, ring crimp with light green primer sealant.
Venezuelan, '90, [CAVIM ], Berdan, ring crimp with light green primer sealant.
Venezuelan, '90, [CAVIM ], Boxer, ring crimp with light green primer sealant silver primer.
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