Firstly, not sure if that load of 220 swift ammo is the same thing I am thinking of. Are they electric primed? When I have more time, I will have to re-educate myself on these. I know I have a file on them, but have so much paper in my office right now, working on the ammo section of my Makarov book, if I put it on the desk in front of me, I wouldn’t be able to find it 30 seconds from now.
About the Remington shot load working a pistol, yes they do. When we first got the ammunition, I fired one full box from my full-sized Colt Govt. Model pistol. At ten yards, approximately, the shot pattern was round and filled most of the paper of a standard NRA 25-yard Timed fire target. Point of aim was standard 6 O’Clock hold. I had one malfunction - a smokestack jam, for a 5% malfunction rate, which I consider quite acceptable for this type of specialty ammunition. This was in a gun that simply does not jam with hardball of combat practice loads with a 200 grain Hensley & Gibbs 68 lead SWC bullet.
I have not fired the CCI version, but I have heard that it does work the actions also, and with good dependability.
The snake on the box is probably ill-advised. If you have time to shoot one in the wild, you have time to walk away from it. They do have their purpose in the overall scheme of things, even though I am terrified of even the sight of a big gopher snake, much less a rattler. I would look upon these cartridges as a survival load only, not a for defense and not a “snake killer” unless you need to eat it. Uhhhgggg!