Mach Iv

This wildcat cartridge is simply the .221 Remington Fireball case necked down to .17 caliber.

The O'Brien Rifle Company is the originator of this very efficient cartridge, a little powder goes a long way.

Based upon the parent case and the type of rifles used, we used a pressure limit of 52,000 C.U.P., the same as the .17 Remington. As there are no doubt many versions of this cartridge in existence, caution is advised in approaching the listed maximum charge.

.17 MACH IV

Gun

DOUGLAS

Max Length

1.400"

Barrel Length

24"

Trim Length

1.390"

Primer

REM 7°

OAL Max

--

Case

REM

OAL Min

--

START LOADS

MAXIMUM LOADS

Cartridge

Bullet

Powder

Grains

Vel.

Powder

Grains

Vel.

C.U.P.

Length

Comment

HDY 25 HP

2015

16.7

3388

2015

18.5

3850

50,200

1.770"

2230

18.3

3398

2230

20.3

3861

52,000

2460

18.5

3417

2460

20.5

3883

51,600

Compressed

2520

18.5

3316

2520

20.5

3768

45,200

Compressed

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