Here's a pic of two slightly different flat point solids designed for deep, straight line penetration for dangerous. game. Top is Cutting Edge and bottom is GS Custom. The GS Custom Flat Point Solid is one bullet I've been unable to stop in my 48" bullet test media.
The theory behind the deep, straight line penetration by flat point solids has to do, as I understand it, with the flat point creating a high-pressure cavitation bubble that surrounds the front portion of the bullet as it penetrates thus lessening disruption of rotational stability and friction of the bullet as it flies within the cavitation bubble. Deflection from instability and friction are the enemies of deep, straight line penetration.
I believe both GS Custom and Woodleigh have done extensive high speed photographic shadow graph analysis studies on the phenomenon in the development of their respective monolithic, penetrating solids. Cutting Edge, North Fork and other makers of monolithic, flat point solids have done quite a bit of media testing with their penetrating solids.
