TRBCD 37gr 'Totally Fragmenting Soft Point'

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.22 Magnum

The .22 Magnum cartridge is a longer version of the .22lr and operates at a slightly higher pressure as well.  While the velocities obtained from firing this cartridge from a pistol are higher than the .22lr, the expanding/fragmenting bullets that are generally used in commercial ammunition for this caliber offer too shallow penetration depths in gelatin to be generally considered to be effective.

 

Full Metal Jacket (FMJ) bullets in this caliber are generally recommended for handguns.  These bullets can almost universally be counted on to yaw/tumble inside of the target (creating greater damage) and to penetrate deeply enough to reliably incapacitate the target.

Typical terminal effects of a .22 Magnum FMJ