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Old January 25, 2013, 11:15 AM   #9
Andrew Wiggin
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Join Date: December 22, 2012
Posts: 225
Not so much the gun as the powder. Cold powder has been demonstrated to produce lower velocities in other tests and my own testing is consistent with that.

Cold:

801 fps
811 fps
819 fps

Warm:

880 fps

The sample size is too small to be sure, but it even looks as though the warmth generated by each shot caused the subsequent shot to be a little faster.

This load has been well proven in laboratory conditions. It consistently expands well in bare gelatin and through heavy clothing. The problem is, I believe all professional testing is done at around 70 degrees.

As far as water goes, it tends to produce the greatest upset that is possible with a bullet. Gelatin and tissue generally show somewhat less expansion than water does. Water beats the crap out of nothing but if you're going to use water, it's best to use a line of milk jugs or plastic bags (Fackler box) and denim and to bear in mind that it's not quite as accurate as properly calibrated gelatin.
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