Mm MAGNUM

This proprietary cartridge was developed for Irwindale Arms, Inc. for use in their auto loading pistol.

The 10mm Magnum could be thought of as a rimless .401 Power Mag, if anyone should happen to remember Herter's proprietary revolver and cartridge. Both cartridges approximate the .41 Magnum in power.

This cartridge is a lengthened 10mm Auto and is loaded to pressure levels similar to the .44 Magnum for use in the IAI handguns.

10mm MAGNUM

Gun

IAI

Max Length

1.255"

Barrel Length

8"

Trim Length

1.245"

Primer

CCI 300

OAL Max

1.555"

Case

STARLINE

OAL Min

1.500"

Bullet

START LOADS Powder Grains

Vel.

MAXIMUM LOADS Powder Grains

Vel.

C.U.P.

Cartridge Length

Comment

165 (L) SWC

15.1

1305 1356

No.7 No.9

14.4 16.8

1483 1541

31,400 30,700

1.520"

Clements

175 (L) SWC

No.7 No.9

12.4 14.1

1266 1285

No.7 No.9

13.8 15.7

1439 1460

32,100 31,600

1.520"

CP

185 (L) FPBB

No.7 No.9

11.9 13.5

1213 1231

No.7 No.9

13.2 15.0

1378 1399

31,400 30,000

1.520"

Co. Custom

195 (L) FN

No.7 No.9

11.5 12.9

1199 1193

No.7 No.9

12.8 14.3

1363 1356

31,500 30,300

1.500"

Clements

NOS 135 JHP

No.7 No.9

15.0 17.8

1494 1551

19.8

1698 1763

37,200 36,800

1.550"

NOS 150 JHP

No.7 No.9

14.2 16.7

1358 1443

No.7 No.9

15.8 18.6

1543 1640

37,300 36,300

1.550"

HDY 155 JHP

No.7 No.9

14.0 16.2

1371 1385

No.7 No.9

15.5 18.0

1558 1574

36,000 36,700

1.555"

NOS 170 JHP

No.7 No.9

13.1 15.3

1271 1324

No.7 No.9

14.5 17.0

1444 1505

36,100 35,800

1.555"

START LOADS

MAXIMUM LOADS

Cartridge

Bullet

Powder

Grains

Vel.

Powder

Grains

Vel.

C.U.P.

Length Comment

SPR 180 JHP

No.7

13.2

1243

No.7

14.7

1412

37,600

1.550"

No.9

14.9

1280

No.9

16.6

1455

38,500

SRA 190 FPJ

No.7

12.8

1206

No.7

14.2

1370

39,000

1.550"

No.9

14.7

1265

No.9

16.3

1438

36,100

SPR 200 TMJ

No.7

12.4

1144

No.7

13.8

1300

37,600

1.550"

No.9

14.1

1222

No.9

15.7

1389

35,200

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