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
|
None
|
None
|
|
Shot size
|
None
|
None
3,25 mm US4
|
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
|
None
|
|
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”)
|
High performance
Steel Cartridges
70mm (2 3/4”)
|
|
Velocity
|
390 m/s (1280 ftps)
|
420 m/s (1375 fps)
|
|
Max pressure
|
780 bar
|
1050 bar
|
|
Momentum
|
9.5 Ns
|
12 Ns
|
|
Mass of shot
|
None
|
None
|
|
Shot size
|
Max 3,0 mm US5
|
Max 4,00mm US1, see note below regarding choke.
|
|
Hardness
|
Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)
|
Surface VH1 (110 Vickers)
Core VH1 (100 Vickers)
|
|
Choke
|
|
Where the steel shot diameter exceeds 3,5 mm, only weapons having barrels with a choke less than 0.5 mm (equivalent to half choke) are to be used.
|
|
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
|
None
|
None
|
None
|
|
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.
|
|
Steel Proofs 28 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
|
400 m/s (1280 ftps)
|
400 m/s (1350 ftps)
|
430 m/s (1410 ftps)
|
|
Max pressure
|
830 bar
|
1050 bar
|
1050 bar
|
|
Momentum
|
7 Ns
|
7 Ns
|
8,5 Ns
|
|
Mass of shot
|
None
|
None
|
None
|
|
Shot size
|
Max 2,5 mm US7
|
None
3 mm US5 and larger, see note below regarding choke
|
None
3 mm US5 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 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 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.
Copyright 2023 © shotguns.se
Last updated: 2023-02-12
|
