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HW30 pellet deformation

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I picked up some 177 9.2 grain crow magnums and shot into one gallon thick clear water filled plastic bottles. I am getting 550 FPS whereas I am getting 660 with JSB 7.33 exact rating. The crows would not penetrate at 31 yards but would at 15. The 7.33 would penetrate all the way at 31 yards. The interesting finding is the unusual deformation whereby a number of skirts got squashed somehow. They were carefully inserted all the way at the breach.




 
That’s a real mystery? What could cause that? Why none on the first target and all on the second?

Is the target backer the same behind each group? If you had a hard and a soft spot Maybe that might affect the penetration and then the shape of the hole in the target. My guess (and it’s not a good one). Either that or you have different pellets cause I can’t see how it would be the gun.
 
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I believe I solved my dilemma...I couldn’t believe the HW30 would tumble the crow magnums in 15 yards....

so I went out to shoot again...and what I discovered was that the card thickness target had no upper support...so it must have moved giving the appearance of key holing.



Once I put a firm support behind it the key holing disappears.

Also...I could make the JSB 7.33 key hole also if the target was unsupported.