While the Bacon Pocket grip is small
@JOHN42768 is spot on in regard to the Pettengill grip. It is ergonomically one of the worst grip designs ever for a handgun. Positioning your hand toward the bottom of the Pettengill's grip, so that you can correctly operate the trigger with your index finger, means that you can only get two fingers on the wood grip.
Pettengill Army Revolver
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Pettengill Belt Revolver
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Repositioning one's hand to get more fingers on the wood forces you to change your hand's angle on the revolver which causes you to block the rear sight with your thumb and it is literally impossible to reach and operate the trigger with your Index finger.
Army Revolver
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Belt Revolver
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Amazingly IIRC with all of the complaints about the Pettengill nearly 100 Pettengill revolvers were purchased at the end of the War, during muster out, by the soldiers who actually used them.