Every registered caliber is defined by its XCR code .

By default, all the dimensions stored in the database are in mm and the specimens measured in accordance with the ECRA measurement system.

Nevertheless, according to your own habits, these values can also be displayed in inches and/or the names of the fields changed into their equivalents in the CIP or Cartwin measurement systems.

 
   

    

   
 

ECRA measurement system

ECRA system

CIP system Cartwin system

B

Bullet

G1 Cal

M

Mouth

H2 S

N

Neck

H1 R

S

Shoulder

P2 O

L

Belt

R3 F/E

H

Head

P1 G

G

Groove

E1 D

R

Rim

R1 C/B

TL

Total cartr. length

L6 Proj

CL

Case length

L3 S

NL

Neck length

L3 - L2 S - R

SL

Shoulder length

L1 O

LW

Belt width

  F - E

  

Belt width + Head length

E  

HL

Head length

  E

GW

Groove width

e D - C

RT

Rim thickness

R C

P

Primer

   
 
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XCR codes

XCR Codes are based on the CHEINISSE-REGENSTREIF system (discussed in the ECCC No. 100, special issue, 1973) are made of 11 characters :

1st group :

2 digits, corresponding to the rounded projectile diameter, in mm. For example, 07 corresponds to a diameter between 6,5 and 7,49 mm.

2nd group :

3 digits, corresponding to the rounded case length, in mm.

3rd group :

3 letters, corresponding successively to the case shape, extraction mode, and priming type.

 

Case shapes

X

(unknown)

B

Bottlenecked case

W

Bulge around case body

K

Caseless, cylindric shape

Q

Caseless, non cylindric shape

U

Folded case

M

Multiple bottlenecked case

P

Paper or biomaterial case

R

Rectangular case

D

Sel-propelled or rocket

S

Special or other case shape

C

Straight case

T

Tapered case

G

Triangular case

 

Extraction modes

X

(unknown)

F

Belted

H

Belted and rebated rim

I

Extraction groove inside case

N

No extraction (caseless)

R

Rebated rim

G

Rimless (grooved)

L

Rimless and grooveless

B

Rimmed

D

Semi-rimmed

S

Special / other

 

Priming types

X

(unknown)

C

Centerfire

A

Compressed air

U

Cupfire

E

Electric

G

Electric pin horizontal

H

Horizontal pinfire

L

Lipfire

N

No primer

P

Radial pin priming

R

Rimfire

D

Side electric

F

Side percussion

S

Special patent / Others

T

Teatfire

 

4th group :

3 digits, used to differentiate calibers, which, while being different, would otherwise have identical codes. The last character may also have a specific meaning : W for Wildcat cartridges.

 

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