Interesting observation demands explanation


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CAnnoneer
September 23, 2005, 01:05 AM
Last time I was at the range, I noticed distinct patterns to the holes produced by my 9mm FMJ 115 gr CCI fired from my Ruger KP89T and the .38 reloads a friend was firing from a rental .357 4" SW revolver. Both guns seemed in perfect order and more accurate than their shooters.

Both types of holes in identical cardboard targets were perfectly round and symmetric. However, the 9mm produced strange creases around the central blown-off hole while the .38 produced clean cuts without the rimming effect.

What is going on??

Both rounds should be supersonic at 7 yards, so it cannot be a pressure wave traveling in front of the 9mm that creases the cardboard.

The .38 slugs looked more roundish than the 9mm, but even the 9mm is pretty round - nothing like pointed rifle bullets. Can it be that the slightly sharper 9mm rips the cardboard a bit before blowing off the center hole?

Guys and gals, please enlighten me!

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Devonai
September 23, 2005, 01:10 AM
What were the .38 reloads? LRN? SWC? FMJ?

CAnnoneer
September 23, 2005, 01:13 AM
I am certain the reloads were FMJ too. Sorry for failing to state that above.

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