Magsafe, which are claimed to use a larger size of pellet to produce deeper tissue penetration. Magsafe claim 10-13" for their rounds compared to 5" for Glaser Silver. The latter is the same penetration quoted for No6 birdshot fired from a shotgun. The "SWAT" range of Magsafe ammo is claimed to produce little or no penetration of interior walls. The IWBA review of these rounds seems to confirm this.
What worries me about the Magsafe is the makers claim that they did well in the "Strasbourg Goat Trials." Many believe these to be a hoax, and even if they are not, Goats are not large enough to be analogues for adult humans.
Magsafe "SWAT" Rounds and their Muzzle Velocities.
|9x19mm || 60gr|| 1950fps|
|.38/357 || 68gr || 1490-1700fps|
|.40/10mm || 46gr || 2100-2400fps|
|.44 || 94gr|| 1500-1800fps|
|.45ACP || 68gr|| 2260fps|
Magsafe do offer .45 Long Colt rounds, but not in their SWAT range.
Rounds like the Glaser and Magsafe were designed to produce a very rapid dumping of their energy into the target. We now know that causing physical damage is a more relieable mechanism of incapacitation. The original Glaser "Blue" use No.12 birdshot of 0.05" diameter. Glaser "Silver" use No.6 of 0.11" and Magsafe use No. 2 or 3 of 0.14" or 0.15" . I believe an even more effective round can be made if even larger pellets were used, such as 0.18" diameter BBs or 0.19" BBBs. I estimate that a 38/9mm round of approximately 80gr would hold 7 to 9 pellets, while a 145gr 44/45 would hold 14 to 16. These pellets would create larger wound tracts, increasing physical damage. The pellets might need a binding agent to keep the pellets in a tighter mass. Something water-soluble such as toffee occurs to me.
.44 magnum, .44 Spl, 9mm Luger, .357 magnum and .38 Special revolvers and .45 Automatics can be found with "snake loads."
These are usually loaded with No.9 to No.11 shot which is too small for home defence. Many .45 Colt derringers can chamber .410 shotshells, and some shotshells will also work in revolvers of this chambering. .45ACP revolvers can use shotshells made from .30-06/.308 brass. Loaded with several balls of buckshot these may be a viable alternate close range load. The Thunder 5 Revolver is designed to use 3" .410 Shotshells or .45 Colt rounds.
There is an obvious requirement for pistol ammunition designed especially for home defence. More information is needed on close range terminal effects and performance against interior structural materials.