Some Nutters took a bunch of ammo, a chronograp
, a bunch of T/C Contender barrels along with a saw to shorten the barrel from 18" to 2" in 1" increments taking readings for each Bbl. Len.
http://www.ballisticsbytheinch.com/40sw.html
Taking a sample by like manufactueres and typical
bullet weights for the cartridges
9mm Parabellum/Luger --5"----4"----3"----2"
Corbon 124 gr. JHP+P 1282 1226 1170 1061
Corbon 115 gr. DPX-- 1315 1265 1215 1132
Speer 124 gr. Gold Dot 1259 1203 1108 1074
.45 ACP aka .45 ACP--5"----4"----3"----2"
Corbon 185 gr. JHP+P 1149 1109 999 939
Corbon 230 gr. DPX-- 1015 983 893 844
Federal 230 gr. Hi Shok 843 814 758 709
.40 S & W --------------5"----4"----3"----2"
Corbon 140 gr. DPX -- 1308 1236 1190 1093
CorBon 165 gr.JHP +P 1225 1164 1085 988
Federal 180 gr. JHP--- 1047 1016 962 905
Speer 180 gr. GD - SB 1053 1011 979 930
Looked at .357 Mag. and it certainly loses
a LOT when you get to a two inch Bbl. length.
Somebody commented on the Bbl. len. in
Semi-AUto versus revolver. Barrel Len. ina
Semi-AUto includes the chamber, so a 5" .45 ACP
only has 4" and a smidgen of rifling. A 5" Bbl.
on a revolver is measured from muzzle crown to
the forcing cone/front of the cylinder, for 4" Bbl.
does not include the chamber length in the cylinder.
I have a full size 1911, as well as a S&W 625 5: Bbl.
heck to get the revolver close to the same O.A.l you'd
need the 4" Bbl. len. - then there's the Barrel to cylinder
gap where you lose some pressure/velocity.
I should chronograph my two .45s and see where
the numbers fall. individual examples and all that.
Randall