Steel proof

 

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Steel Proof

In Swedish

Proof Mark

Valid

Type of Proof

1992->

Steel proof, according to below.

Stål prov enligt nedan.

 

Steel Proofs 12 ga

CIP hat two different standards for 2 3/4 cartridges: one normal cartridge and one high performance cartridge. The High Performance Cartridge is almost the same as the standard for magnum.

2 3/4” or 70mm Cartridges

CIP

Normal Lead
cartridges 70mm (2 3/4”)

Normal Steel
cartridges 70mm (2 3/4”)

High performance Steel cartridges 70mm (2 3/4”)

Velocity

None

425 m/s (1395 ftps)

430 m/s (1410 ftps)

Max pressure

740 bar

740 bar

1050 bar

Momentum

None

12 Ns

13,5 Ns

Mass of shot

None

32 grams

None

Shot size

None

None

3,25 mm US5

None

4,00mm US1, see note below regarding choke.

Hardness

None

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Choke

None

None

Where the steel shot diameter exceeds 4 mm, only weapons having barrels with a choke less than 0.5 mm (equivalent to half choke) are to be used.

Magnum Cartridges

CIP

Magnum Lead cartridges 76mm (3”)

Magnum Steel cartridges 76mm (3”)

Magnum Steel cartridges 89mm (3.5”)

Velocity

None

430 m/s (1410 ftps)

430 m/s (1400 ftps)

Max pressure

1050 bar

1050 bar

1050 bar

Momentum

None

15 Ns

19 Ns

Mass of shot

None

None

Max 32 gram

Shot size

None

None

Max 4,00mm US1, see note below regarding choke.

None

Max 4,00mm US1, see note below regarding choke.

Hardness

None

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Choke

None

Where the steel shot diameter exceeds 4 mm, only weapons having barrels with a choke less than 0.5 mm (equivalent to half choke) are to be used.

Where the steel shot diameter exceeds 4 mm, only weapons having barrels with a choke less than 0.5 mm (equivalent to half choke) are to be used.

Momentum = mass of shot x its velocity, measured in Newton-seconds (!). It is calculated by multiplying the weight of shot load (in kgs) by the velocity (at 2.5 m) in m/s. So, a 30 g load at 385 m/s has a momentum of 0.030 x 385 = 11.55 Ns i.e. just under the 12.0 Ns limit

Steel Proofs 16 ga

CIP has only one standard for 16 ga, and that equivalent to Normal Steel Cartridges, since there are no 16 ga magnum standardized there can be no High Performance Cartridge in 16 ga.

CIP

Normal Steel
Cartridges 70mm
(2 3/4”)

Velocity

390 m/s (1280 ftps)

Max pressure

780 bar

Momentum

9.5 Ns

Mass of shot

-

Shot size

Max 2,60mm US6

Hardness

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Choke

 

Steel Proofs 20 ga

CIP hat two different standards for 2 3/4 cartridges: one normal cartridge and one high performance cartridge. The High Performance Cartridge is the same as the standard for magnum.

CIP

Normal Steel
cartridges
70mm (2 3/4”)

High performance
Steel Cartridges
70mm (2 3/4”)

Magnum Steel
Cartridges
76mm (3”)

Velocity

390 m/s (1280 ftps)

410 m/s (1350 ftps)

430 m/s (1410 ftps)

Max pressure

830 bar

1050 bar

1050

Momentum

9.3 Ns

11 Ns

12 Ns

Mass of shot

-

-

-

Shot size

Max 3,00 mm US5

None

3,25mm US4 and larger, see note below regarding choke.

None

3,25mm US4 and larger, see note below regarding choke.

Hardness

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)

Choke

 

Where the steel shot diameter exceeds 3.25 mm, only weapons having barrels with a choke less than 0.5 mm (equivalent to half choke) are to be used.

Where the steel shot diameter exceeds 3.25 mm, only weapons having barrels with a choke less than 0.5 mm (equivalent to half choke) are to be used.

 

For high perfomance cartridges the barrel shall have a quality defined by:

R = tensile strength (resistance) in N/mm2 measured on the finished gun.

S = cross section in mm2 of the barrel crown, measured at the muzzle. If the barrel is choked the measurement shall be made halfway at the length of the choke.

The quality (Q) shall be Q = R x S where Q shall be > 65 000 N

The choke cone is not allowed to have more slope than 0 degrees and 30’. Maximum angle is 1 degree at the center.

 

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Last updated: 2014-01-27