A 200 grain LRN .38 Special bullet that tumbles will not give consistent performance as will a 148 grain HBWC .38 Special. Penetration will be inconsistent, specifically. The yaw (not yawl) will likely have a very negative effect of the desired straight path of the bullet through tissue, too. Water jugs give good measurements (after calculating the difference between water and tissue/gelatin) of expected penetration depth. Expansion may be off a bit, however as relates to tissue/gelatin.
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