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Old 04-30-2018, 08:09 AM   #1
rman
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Default Chronograph Data .357 Mag Rifle vs Revolver

I chronographed these loads back in 2015. I use them in a Rossi 92 lever action rifle. This is the gun I use for pistol caliber in Cowboy Silhouette matches. Just for kicks I decided to check some in a revolver. These are mild loads using .357 Magnum brass and cast bullets

The load:
Norma Brass, CCI 500 Primers, Berry's Hard Cast 125 gr. SWC bullets and 5.3 gr. of W231 powder.

The gun:
Rossi 92 .357 Mag carbine with 20" barrel

String 1
#1 - 1173
#2 - 1158
#3 - 1159
#4 - 1175
#5 - 1162
#6 - 1186
#7 - 1194
#8 - 1167
#9 - 1161
#10 - 1177
#11 - 1209
#12 - 1165
#13 - 1155
#14 - 1186
#15 - 1193
#16 - 1189
#17 - 1177
#18 - 1151
#19 - 1194
#20 - 1163

High - 1209
Low - 1151
Extreme Spread - 58
Average - 1174.7
Standard Deviation - 15.6

The gun:
Smith & Wesson Model 60 .357 Magnum 3" barrel

#1 - 870.1
#2 - 858.2
#3 - 823.3
#4 - 826.1
#5 - 819.8
#6 - 848.1
#7 - 795.8
#8 - 804.6
#9 - 808.8
#10 - 786.1

High - 870.1
Low - 786.1
Extreme Spread - 84
Average - 824.1
Standard Deviation - 26

Note that the average velocity for the rifle was 1174.7 fps. The revolver's average was 824.1 fps. That is a difference of 350 fps. That figures out to be about 20.8 fps per inch of barrel length.
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Last edited by rman; 04-30-2018 at 12:49 PM.
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Old 05-06-2018, 11:26 AM   #2
Vetter
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Good report rman!
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