Government

Trapdoor Springfield

After one of the most thorough small arms research and development programs ever launched by the U.S. Military, the .4570 Government cartridge was adopted by the U.S. Military in 1873 for use in the new, single-shot "trapdoor" Springfield rifle.

It was, and continues to be, a popular cartridge for sporting use and many repeating and single-shot rifles were chambered for it.

Older firearms such as the 1873 "trapdoor" Springfield should generally not be loaded beyond 18,000 P.S.I. This data was developed for these type firearms.

The .45-70 was originally developed to use cast lead bullets and continues to be an excellent cartridge for this purpose. The single best Accurate powder for use in low pressure loads and cast bullets in the .45-70 Government cartridge is 5744.

.45-70 GOVERNMENT (Trapdoor Springfield)

Gun

TEST BARREL Max Length

2.105"

Barrel Length

24" Trim Length

2.085"

Primer

CCI 200 OAL Max

2.550"

Case

REM Nickel OAL Min

2.490"

CAUTION! This data is intended only for firearms safe for use with smokeless propellants. A firm crimp is required for .45-70 for all smokeless powder loads.

START LOADS

MAXIMUM LOADS

Cartridge

Bullet

Powder

Grains

Vel.

Powder

Grains

Vel.

P.S.I.

Length

Comment

300 (L) PB

5744

27.9

1405

5744

31.0

1597

18,000

2.550"

Clements

340 (L) HP

5744

27.0

1314

5744

30.0

1494

14,600

2.520"

LY457122HP

2495

51.3

1628

2495

57.0

1850

18,000

4350

53.1

1384

4350

59.0

1573

17,900

Compressed

3100

54.0

1255

3100

60.0

1426

15,100

Compressed

8700

54.0

1059

8700

60.0

1203

10,400

Compressed

378 (L) RNGC

5744

25.6

1247

5744

28.5

1418

15,100

2.565" *

LY457483

2495

45.0

1479

2495

50.0

1681

14,500

4350

48.6

1259

4350

54.0

1431

15,400

3100

50.4

1159

3100

56.0

1317

13,900

8700

54.0

1015

8700

60.0

1153

8,300

Time Line Past Tense

.45-70 GOVERNMENT - Trapdoor Springfield (continued)

START LOADS

MAXIMUM LOADS

Cartridge

Bullet

Powder

Grains

Vel.

Powder

Grains

Vel.

P.S.I.

Length

Comment

405 (L) FN

5744

24.3

1226

5744

27.0

1394

16,100

2.550"

Penny's

405 (L) PB

5744

24.7

1192

5744

27.5

1355

18,000

2.560"

Clements

420 (L) FN

5744

25.6

1210

5744

28.5

1375

16,100

2.600" *

LY457193

2495

45.0

1457

2495

50.0

1656

17,700

4350

50.4

1297

4350

56.0

1474

16,200

Compressed

3100

54.0

1251

3100

60.0

1422

18,200

Compressed

8700

54.0

1025

8700

60.0

1165

11,700

Compressed

475 (L) RNGC

5744

24.3

1102

5744

27.0

1253

18,800

2.680" *

LY457406

2495

40.5

1377

2495

45.0

1565

16,000

4350

40.5

1107

4350

45.0

1258

16,100

3100

44.1

1074

3100

49.0

1221

16,300

8700

54.0

915

8700

60.0

1040

15,900

500 (L) FN

5744

23.4

1070

5744

26.0

1217

16,700

2.635" *

SAECO #22

2495

39.6

1348

2495

44.0

1532

18,400

4350

37.8

1034

4350

42.0

1175

16,300

Compressed

3100

40.5

1001

3100

45.0

1138

16,500

Compressed

8700

49.5

842

8700

55.0

957

9,800

Compressed

500 (L) PBRN

5744

22.5

1063

5744

25.0

1209

18,000

2.850"

Lyman

500 (L) schmitzer

5744

22.7

1072

5744

25.3

1219

17,500

3.010"

Lyman

520 (L) RNGC

5744

21.6

1060

5744

24.0

1205

16,300

2.655"

Penny's

530 (L) postell

5744

20.1

1036

5744

22.4

1178

18,000

2.950"

Lyman

530 (L) RN

5744

25.6

1024

5744

28.5

1280

18,400

2.830" *

LY457124

2495

41.4

1237

2495

46.0

1406

11,600

4350

43.2

1167

4350

48.0

1326

16,600

3100

49.5

1196

3100

55.0

1359

16,900

8700

58.5

932

8700

65.0

1059

15,800

570 (L) jones

5744

19.8

949

5744

22.0

1079

18,000

2.870"

American

SPR 400 JSP

5744

23.4

1031

5744

26.0

1172

17,200

2.560"

* Over SAAMI Maximum OAL

* Over SAAMI Maximum OAL

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