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Old March 17, 2001, 08:37 PM   #1
Banzai
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Join Date: January 29, 2000
Posts: 275
Well, the new chrony (this is #2) survived it's first outing to the range, and I thought that I'd share some of the data that I got from some factory and hand pistol loads.

Temp:66F
Humidity: 63% relative
Alt:+22ft/sea level
Distance:10ft from muzzle
Rounds Fired:10 each

Firearm #1 is a S&W Sigma 9mm, 4 inch barrel
Firearm #2 is a Taurus PT-111 9mm, 3.25 inch barrel

124gn Hydra-Shok, 1120fps
#1 #2
Lo:1028 1027
Hi:1056 1053
Av:1045 1040
ES:28 25.9
SD:10.5 9.2

147gn Golden Saber, 990fps
#1 #2
Lo:910 938
Hi:945 970
Av:928 949
ES:35.2 32.6
SD:12.7 13.0

115gn Berrys 9mm, CCI500, WIN cases, 4.5gn TiteGroup
Hodgdon load data, approx. 1150fps (data from phone conversation with Hodgdon)
#1
Lo:1049
Hi:1089
Av:1072
ES:40.4
SD:13.1

115gn Sierra 9mm, CCI500, WIN cases, 6.7gn AA5
Sierra load data, approx. 1300fps from a 5 inch barrel
#1
Lo:1077
Hi:1130
Av:1104
ES:52.7
SD:14.8

124gn Sierra 9mm, CCI500, Win cases, 8.7gn AA7
Sierra load data, approx 1200fps from a 5 inch barrel
#1
Lo:1054
Hi:1105
Av:1073
ES:51.1
SD:18.1

It seems that about 1 inch of barrel in 9mm (at least from 4 to 5 inches) is worth about 100fps in handload data. I wish that I had run some of these loads through the PT-111, but I ran out of time and the range closed before I had a chance.
While my Standard Deviations of my hand loads seem to be in the norm for factory loaded cartridges, it seems like my Extreme Spreads seem to be quite large. What causes this? Is this out of spec with what you've seen and clocked in your own loads?

Tom

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Old March 17, 2001, 08:39 PM   #2
Stephen A. Camp
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Join Date: April 16, 1999
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Hello. While extreme spreads that are very small usually indicate an accurate load, such is not always the case. I do not understand why, but it is so.

In handguns, an extreme spread of 50 ft/sec or so is considered "good".

Best.
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Old March 17, 2001, 11:19 PM   #3
S&W Man
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Join Date: March 4, 2001
Location: Northern Indiana
Posts: 29
The longer barrel will give you more speed to a point. Every caliber has a point where if reverses. I do not know what barrel legenth 9mm is at reversal point. I also know for fact that the difference between a 4 and a 5 inch barrel on their duty guns, both being the same, made the effectivness of the shooting of two depts near here vastly different. Both used the same ammunition, one had a knockdown or stopping rate of 100% and the other only had about a 55% with a 1" shorter barrel.


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Old March 20, 2001, 06:39 PM   #4
MIKE14
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Posts: 147
Keep an eye on the standard deviation the lower the number the more consistant the load.
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Old March 22, 2001, 06:37 PM   #5
Big Bunny
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Location: New South Wales - Australia
Posts: 605
They all look pretty good to me!
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