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I located some old records of velocity readings and barrel length trials I conducted during i983.

Walther GSP semi auto target pistol 22LR using the factory barrel 4 inch nominal and a 7 1/2inch piece of 22LR Winchester rifle barre,l very good used condition fitted to suit with a standard clearance chamber cut.
Sand bag rest open sights 25mtr range ambient temperature 25C.

Code:
             FPS       LO    HI    ES   MEAN  SD   Group Size
4 inch
Winchester Leader     810   902    92   875   37     3.50"
Stirling Target       870   951   111   923   45     3.50"
Browning Nail Driver  873   920    47   894   23     2.00"
Winchester T22        849   891    42   874   16     1.75"

7 1/2 inch
Winchester Leader     985  1016    31  1001   14     1.75"
Stirling Target       944  1021    77   991   31     2.50"
Browning Nail Driver  967  1001    34   983   15     2.00"
Win T22               951   974    23   961   10     1.50"
5 shot group magazine fed, cleaning after each 5 shot group.
Stirling was" budget" ammunition but reliable in functioning
Premium competition grade was not trailed. Group size rounded out.
 

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George,

That looks like an interesting page of data, but is there a question in there, somewhere? To be honest, I'm not entirely sure what all the numbers mean, though... :confused:
 

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You don't have to post questions. Just information you think someone would find interesting is fine.

One revealing thing appears to be the powder burn rate differences for these rounds. The Winchester Leader was charged with something slower burning than the others because it gained 125 fps in the longer barrel while the Nail Driver and T22 had 89 and 87 fps difference, respectively. The Stirling appeared to have the fastest burn up, with only 68 fps difference. The slower burn would be more likely to get you more velocity in a rifle's longer barrel.

It would be interesting to repeat this with current lots of available ammunition. It would have been more interesting if all 50 rounds had been fired. It takes about 30 just to get good statistical confidence your average is representative of the whole lot. But that takes a lot of shooting, so we take what we can get.
 

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Discussion Starter · #4 ·
unclenick

This initial trial was the result of general observations from personal experience and a questioning mind. I obtained some indicators and other highly competitive shooters run with it. From memory RWS ( a pistol specific loading) lead the field for the short barrel . I do not recall the the makers of the trial long barrel cartridges . There was a group of US,UK and European standard velocity rifle match target in there with premium pistol fodder.

This turned out to be an ongoing saga something akin to a ongoing daytime soap opera. I never did find out the end result as I relocated to another state.

No doubt the local gun stores were kept active with obtaining premium fodder
 
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