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Old 10-08-2012, 13:46   #12
Andrew Wiggin
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Join Date: Dec 2011
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I had some trouble with my chrono and it missed the velocity on several BB calibration shots. There were also a few that came in well under the acceptable velocity of 590-610fps. My BB gun seems to shoot faster when it's cold. Maybe I'll keep it in the cooler with the gel next time. 10mm Reloading Forum I finally got a couple shots that were close to the right velocity so the calibration shot will be 586.4 fps (still a touch low) and 3.5". The 10mm shots are taken through 4 layers of denim using an EAA Witness 4.5" barrel.

First up is 180 gr XTP over 11.8gr of AA#7, 1.255" COL, at a measured impact velocity of 1,290. Penetration is 13.25". It exited the first block and went a about an inch and a quarter into the second block. Next time I'll have to cut the blocks even so there is no air space between them. I don't know how much, if any, effect that has. You can see that this bullet fragmented a bit. I was going to weigh the recovered fragments, but the piece you see in the on picture got left out there. Sorry. Maximum expansion is 0.898" and minimum is 0.636". Retained weight is 174.8 gr.


10mm Reloading Forum

10mm Reloading Forum

10mm Reloading Forum

10mm Reloading Forum
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Last edited by Andrew Wiggin; 11-14-2012 at 11:50..
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