|March 17, 2001, 08:37 PM||#1|
Join Date: January 29, 2000
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.
Humidity: 63% relative
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
147gn Golden Saber, 990fps
115gn Berrys 9mm, CCI500, WIN cases, 4.5gn TiteGroup
Hodgdon load data, approx. 1150fps (data from phone conversation with Hodgdon)
115gn Sierra 9mm, CCI500, WIN cases, 6.7gn AA5
Sierra load data, approx. 1300fps from a 5 inch barrel
124gn Sierra 9mm, CCI500, Win cases, 8.7gn AA7
Sierra load data, approx 1200fps from a 5 inch barrel
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?
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|March 17, 2001, 08:39 PM||#2|
Staff In Memoriam
Join Date: April 16, 1999
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".
|March 17, 2001, 11:19 PM||#3|
Join Date: March 4, 2001
Location: Northern Indiana
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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