I'm curious, what order do you place the different ammunition types in and why? I thought about getting the S&W Governor and I'd like to know your rationalization.
I don't share the common phobia of snakes, so I wouldn't likely kill a snake unless it were venomous and I couldn't simply move away from it.
That said, the birdshot would be loaded into the first chamber to be fired, and I'd make sure when I closed the cylinder to remember that revolvers revolve BEFORE firing.
In the case of larger animals (we have a lot of fox and coyote in our neighborhood, and things like bear and cougar are possible), the noise (and minor sting) from the first round has a good chance of convincing the animal that I am not prey. If not, the follow up .45 Colt rounds add more power to my argument. For those larger animals, I'd actually prefer to carry a .44 Magnum, Desert Eagle 50AE, or the S&W 500 Magnum. But I do not own any of those.
The other use for this load out is close quarters self defense. As an example, a car jacking. The bad guy is going to be
right there. If they aren't, I can probably just drive away. In this case, the Judge is carrying 2 rounds of Winchester PDX shotshell. These shells have 16 birdshot pellets behind 4 plated disks. At the range I'm talking about, those will all land in an area of just a couple inches. There is good penetration from the disks, sting from the pellets, and the noise to back them off a step or two, but minimal precision is required. And there's still the 45 Colt.
I'm guessing the snakeshot goes first, followed by the slugs. One somewhat common method for loading home defense shotguns is to load less lethal rounds first, and rounds with more penetration later on. For example, in a pump shotgun with 6 shots, you might have 2 shells of birdshot, 2 shells of buckshot, and 2 slugs.
You do you, but I do not personally care for the shotgun as a home defense weapon.
The size makes it much more difficult to move through a house, especially if you prefer not to reveal your position. Holding the weapon vertically will mitigate this to some degree, but at the cost of taking longer to get the muzzle on target. One of the bullpup designs would also help, and if I were to choose a shotgun, it would be a bullpup.
Typical shotgun as very rounds limited, and unless you're Jerry Miculek, you're probably not going to reload them quickly. There are some bullpups (such as the KSG) that have twin 6 round magazines. Changing between them is as easy as a magazine swap. And the number of rounds isn't usually going to be an issue.
Shotguns also have a limited range. The further away the target, the more spread. In a home defense scenario, this equals a larger chance of hitting unintended targets.
Then there is the recoil. You're never going to double tap a shotgun. And the smaller your pellets, the less likely you are to achieve a quick end to the threat, which makes the rapid follow up shot important. Slugs do help with this, since they decrease the need for a follow up shot.
And of course, there's the noise. Shooting any firearm in a room is painful and can cause permanent hearing loss. My home defense gun is suppressed, the fix this. That makes it longer than most handguns, but it's still usable one handed, leaving the other hand free for things like doors.
If you add a suppressor to a typical shotgun, the bulk problem gets even worse. And on a bullpup, it becomes as bulky as a typical shotgun.
Personally, I don't like this method. Because your first two shots are less likely to stop the attack, and your last two are more likely to overpenetrate. I just load buckshot in mine.
In testing, the risk of overpenetration from a rifled 12 gauge slug is no greater than it is for typical defensive handgun ammo. And it's considerably less likely to over penetrate than the cheap hardball ammo many people still have in their pistols.
A round hitting a body causes damage in two ways.
First is the actual damage to the tissues the round passes through. This is simple. The larger the diameter of the round, the more tissue it destroys. This is why good defensive ammo mushrooms.
Second is shock waves. Kinetic energy transferring to the tissues surrounding the impact site. This causes temporary or permanent cavitation. Temporary cavitation doesn't really damage anything. Permanent cavitation does. Even the best defensive handgun ammo does not leave any significant permanent cavitation. This is why shot placement with handgun is so much more important than caliber. Birdshot and buckshot also cause no significant permanent cavitation. Buckshot does have adequate penetration, though, so it increases the chances of hitting something vital without requiring as much precision. Slugs, however, do cause significant permanent cavitation. If the shot lands within a couple inches of a vital organ, it will likely result in death.
If I were to chose a shotgun for home defense, it would be a twin magazine bullpup design like the KSG. I'd use the 2 3/4" shells rather than 3" to bring the capacity to 7+7+1. I'd likely have buckshot in the chamber and possibly one in the first magazine. I'd add a suppressor, because I like being able to hear music, my grandkids, birds...
But you do you.