Determination of caliber of damaged bullets

In many cases a bullet is so deformed or even fragmented that no useful measurement of its diameter can be made, hence the caliber cannot be determined by the customary procedure. B.D. Munhall of the H.P. White Laboratory, following a suggestion made to him by Lt. Ed. Crowthers of the Pennsylvania Police, has worked out a method whereby the probable original caliber and number of grooves in the barrel can be determined. Where at least one groove and one land on a mutilated bullet remain (without distortion), a measurement of their combined width may give an approximation of the original caliber and the number of grooves in the barrel from which it was fired, by using a table constructed from calculations made from manufacturers' factory specifications. Such a table, compiled by Munhall, is presented in Table A-21. The data were secured by multiplying factory land diameters and groove diameters by pi (3.1416) to get the circumferences and then dividing each of the two resulting figures by varying numbers of grooves. The tabulations here given are limited to pistol and revolver caliber determinations. Obviously, since there is overlapping of the ranges of figures in the left hand column in a number of instances, the precise answer may not always be given. As pointed out by Munhall (personal correspondence) „these tabulations are simply a guide, and such other factors as bullet weight and size of fragment must be considered." The tabulation may be considered as useful, within limitations.

Nicht gescannt!

Spanish and Belgian firms who specialized in rifling of barrels

Name of gun

Type

Maker of gun

Rifled by Faustino Artiagoita, Eibar

Apache

Automatic

Ojanguren y Vidosa

Avion

Automatic

Bartra y Azpiri

Colon

Automatic

Antonio Azpiri

Destroyer

Automatic

Isidro Gaztafiaga

LeDragon

Automatic

Aguirre y Cia.

Looking Glass

Automatic

Domingo Acha

„Azul" Oscillante

Revolver

Eulogio Arostegui

Destroyer (several models)

Revolver

Isidro Gaztañaga

Guisasola (many models)

Revolver

Isidro Gaztañaga

Puppit

Revolver

Ojanguren y Vidosa

Tanque

Revolver

Ojanguren y Vidosa

Rifled by J. Debroux, Liege

Le Page

Automatic

Mre. d'Armes Le Page

Hammerless

Revolver

Theate Freres

Lincoln

Revolver

Theate Freres

Rifled by Echave y Arizmendi, Eibar

Elcid

Automatic

Casimiro Santos

Martian

Automatic

Martin A. Bascaran

Rifled by Teodoro Elcoro, Eibar

„B. H."

Automatic

Beistegui Hermanos

Libia

Automatic

Beistegui Hermanos

„B. H."

Revolver

Beistegui Hermanos

Rifled by D. Gillet, Liege

Jieffeco

Automatic

Robar and DeKerkhove

Melior

Automatic

Robar and DeKerkhove

Rifled by Theodoro Isarra, Ermua

Bolumburu Automatic

Automatic

Gregorio Bolumburu

Etna, Invicta, Protector, Tisan, Unis*

Automatic

Santigo Salaberrin

Regina, Regent, Rex*

Automatic

Gregorio Bolumburu

Vainqueur

Automatic

Aurelio Mendiola

Rifled by J. Jamart, Liege

Baby

Revolver

L. Ancion-Marx

Bull Dog

Revolver

L. Ancion

Cobolt

Revolver

L. Ancion

Constabulary

Revolver

L. Ancion

Extracteur

Revolver

L. Ancion

LeNovo

Revolver

L. Ancion

Lincoln

Revolver

L. Ancion

Bijou (many models)

Revolver

D.D. Debouxtry

Rifled by Mendizabal y Barranco, Eibar

Acier Comprime

Automatic

Apaolozo Hermanos

„A.A.A."

Automatic

A. Aldazabal

Aldazabal

Automatic

A. Aldazabal

Campeon

Automatic

Hijos de C. Arrizabalaga

Destructor

Automatic

Retolaza Hermanos

Errasti

Automatic

Antonio Errasti

Especial

Automatic

Hijos de C. Arrizabalaga

Gallus

Automatic

Retolaza Hermanos

Jubala

Automatic

Larranaga y Elartza

Liberty

Automatic

Retolaza Hermanos

„Military"

Automatic

Retolaza Hermanos

Paramount

Automatic

Retolaza Hermanos

Retolaza

Automatic

Retolaza Hermanos

Sharp Shooter

Automatic

Hijos de C. Arrizabalaga

Stosel

Automatic

Retolaza Hermanos

Singer

Automatic

Francisco Arizmendi

Titanic

Automatic

Retolaza Hermanos

Triumph

Automatic

Apaolozo Hermanos

Walman

Automatic

Francisco Arizmendi

Ydeal

Automatic

Francisco Arizmendi

Constabulary

Revolver

Francisco Arizmendi

Dreadnaught

Revolver

Antonio Errasti

Errasti

Revolver

Antonio Errasti

Especial

Revolver

Antonio Errasti

Goliat

Revolver

Antonio Errasti

Oicet

Revolver

Antonio Errasti

Gallus

Revolver

Retolaza Hermanos

Rifled by Orban and Gilman, Liege

Dictator

Automatic

Liege United Arms Co.

Le Rapide

Automatic

J. Bertrand

Monobloc

Automatic

J. Jacquemart

Legia Demontants(made for French trade)

Automatic

Nicolas Pieper

N. Pieper

Automatic

Nicolas Pieper

Pieper „Basculant"

Automatic

Nicolas Pieper

Pieper „Demontant"

Automatic

Nicolas Pieper

Hammerless

Revolver

Jannsen Fils and Co.

Lincoln

Revolver

Jannsen Fils and Co.

Puppy

Revolver

Jannsen Fils and Co.

Hammerless

Revolver

Theate Freres

Lincoln

Revolver

Theate Freres

*Guns in each group are the same, but sold under different name.

Manufacturers of automatic pistols

Name and (or) model

Manufacturer (or source)

Location

.45 cal. Mod. 1911

Contracts (partially fulfilled) let to: Springfield Armory No. American Arms Co. (less than 100 produced)

Springfield, Mass. Quebec, Canada

.45 cal. Mod. 1911A1

Contracts (partially fulfilled) let to:

Springfield Armory

Ithaca Gun Co.

Remington Arms Co.

Remington-Rand

Singer Manufacturing Co.

Union Switch and Signal Co.

Springfield, Mass. Ithaca, N. Y. Bridgeport, Conn. Syracuse, N. Y. Elizabethport, N. J. Swissvale, Pa.

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