Test Protocol
The gelatin is 100% pure from
Kind & Knox. It is mixed to 10% and calibrated using a .177 BB at 590
fps to a penetration range of 7.5 - 9.5 cm. A minimum of 3 rounds
(unless otherwise noted) are
fired into the gel from a distance of 3 feet through two layers of loosely
layered denim.
Definition of Terms
Velocity -
Readings are a running average of all shots I have
chronographed of the particular brand of ammunition. A running average
provides the greatest possible number of readings and averages out the
effects of environmental conditions.
FPE - The foot pounds of energy calculated using the
advertised weight. (M x V x V / 450240)
Penetration
- Depth in inches, is measured in a
straight line from point of entry to point of deepest penetration.
Expansion -
Recovered rounds were measured at multiple points
and then averaged to account for uneven expansion. Area of Dispersion is
used for fragmenting rounds.
STD DV
- Standard Deviation, simply put measures the
variability of data (less is better)
Weight - (.32acp only) Recovered rounds were rinsed, all
denim removed, then allowed to dry before weighing.
OAL - (.32acp only) Over all length is listed because
some shorter rounds can shift inside the magazine and become "rim locked".
