Another Chronograph Session

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GeneCC
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Another Chronograph Session

Post by GeneCC » October 24th, 2012, 8:28 pm

Sorry for the long delay....

Today's temp was 70 Fahrenheit (I think that's 25 Celsius). Clear skies.

Showed up at the range with my Pro Chrono and five different rounds. Between each string of five I let the pistol cool, swabbed the barrel with a patch soaked in Shooter's Choice and then dried it with lint free patches.

I did NOT test for accuracy. I did not even try to hold a target. I'm not an experienced Chronograph user and do not want to shoot it by accident. I would guess that the shot to shot consistency would correspond to accuracy.

All rounds were in brass cased reloadable cartridges. I did not bring Russian offerings this time around.

Note - No failures to fire, feed or extract. As usual this pistol just shoots.

Unless otherwise noted all measurements are Feet/Second

Critical Defense 95 gr FTX Flex Tip
989
971
981
974
970

Average 977.00
1st Std Dev 7.97
95% Confidence 6.98

95% Low 970.02
95% High 983.98

Comments - sweet shooting round. Most consistent shooters of the bunch. I would love to try this out in Gelatin some day.


Hornady XTP 95 gr XTP
899
913
873
917
904

Average 901.20
1st Std Dev 17.30
95% Confidence 15.16

95% Low 886.04
95% High 916.36

Not bad, Older round. Probably a nice self defense load


Prvi Partisan (PPU) 93gr FMJ
1061
1099
1069
1103
1013

Average 1069.00
1st Std Dev 36.25
95% Confidence 31.77

95% Low 1037.23
95% High 1100.77

Comments - Punishing in a P-64. Widest deviation. Probably akin to the Corbon +P Makarov. I've heard rumors that some Soviets loads were this rugged. I don't know, never shot genuine Soviet mil spec issue.


Sellier and Bellot - S&B 95gr FMJ
929
944
911
901
951

Average 927.20
1st Std Dev 21.22
95% Confidence 18.60

95% Low 908.60
95% High 945.80

Average round. Not bad for the price.


Win 9mm Mak 95gr FMJ
937
908
928
913
931

Average 923.40
1st Std Dev 12.34
95% Confidence 10.82

95% Low 912.58
95% High 934.22

Winchester's "Metric" offering. Second best performer in consistency for a fraction of the Hornady CD price.



Brass recovery averaged sixty percent. That is, for every ten rounds shot four went missing. The P-64 is a great handgun. Just isn't reloader friendly.

95% means "95 percent confidence interval". As one Prof told me a long time ago, "95 percent confidence interval means if you repeat the test 100 times 95 of the trials will have data that lies within the low and high points of the 95 percent confidence interval.

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fully machined
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Re: Another Chronograph Session

Post by fully machined » October 24th, 2012, 10:39 pm

Thanks for that. WOW--that PPU is moving. I've heard that a lot of the Winchester metric ammo is S&B.
Your chrony results give support to that.

frankmako
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Re: Another Chronograph Session

Post by frankmako » October 25th, 2012, 8:57 pm

good info. next time i got my chronograph setup i will test some of the steel case ammo.

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RobsTV
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Re: Another Chronograph Session

Post by RobsTV » October 26th, 2012, 8:40 am

Nice results.

For comparison to my recently tested Bodyguard 380, the 9x18 does better.

Federal 95gr FMJ (OAL = .958 -.964)
853 fps, pf=81, 154 ft/lbs, ES-61, SD-16
(23 round test string) Hi = 877, Low = 816

GeneCC
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Re: Another Chronograph Session

Post by GeneCC » October 27th, 2012, 11:15 pm

fully machined wrote:Thanks for that. WOW--that PPU is moving. I've heard that a lot of the Winchester metric ammo is S&B.
Your chrony results give support to that.
An earlier box of Winchester Metric that I had bought had the same green round carrier as the Selier & Bellot that I tested in the above sessions. The current version of Winchester that was tested used a white bullet carrier.

Might be, might not be. I do not know.

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juniustaylor
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Re: Another Chronograph Session

Post by juniustaylor » October 28th, 2012, 4:36 pm

IIRC, a box of Winchester Metric 7.62x54R that I had said that it was made in the Czech Republic. Some folks even reported seeing S&B marked headstamps in boxes of Winchester Metric.
US Air Force Veteran - OEF/OIF

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