7.65 parabellum

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Hi guys, I'm a newbie!


Question: What is the REAL groove diameter of the 7.65 Parabellum barrel? I am fast coming to the conclusion that the 0.308 and 0.309 inch stories I keep hearing are myths that have been repeated so many times every one "knows" something that ain't so. I have measured the barrels on four DWM Model 1920's, a WWII era Mauser that had been rebarreled, two Mauser re-intro's and two Ruger P89's. All measured 0.3110 to 0.3115.


Now contrary to rumours, back at the begiining of time DWM kept very tight tolerances on barrel diameter.


So what's the real story here?


After the controversy dies down, the next questuion is what do you feed it? Winchester factory fodder is obviously not going to work. Aside from the question of having enough steam to cycle the action, Winchester (I got this from the horse's mouth.) loads a bullet with a nominal diamter of 0.309 plus 0.000, minus 0.003. This is obviously not conducive to accuracy.


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