A lot of folks get quite hot about the idea of using a coachgun for HD .... the two shots and relatively slow reload being cited as the major problem.
Everyone's situation is different and for me I actually favour a coachgun as a HD tool .... well, actually I'm on the lookout for a 24" SxS rather than the 20" coachguns that are commonly available. My motivation for a SxS rather than a higher capacity pump ... well, its purely political.
Our Law enforcement community is strongly opposed to the concept of HD .... I think the idea of people shooting at other people scares the tripe outa the cops and the politicians and the woolly headed namby pamby leftist liberal politically-correct tree hugging hippy types as well. To put that in perspective, our cops don't carry firearms ..... one of the only police forces in the world to not carry firearms (they tote them around in their cars, but not on their belts).
I live in a semi-rural area (mostly 2 1/2 acre blocks of land on the outskirts of suburbia) ..... lifestyle block or "hobby farms". If'n I hear a bump in the night (or the crash of the door being kicked in) I'm supposed to call the cops and hang tight (or get outa Dodge) till they get there. I don't accept that as a realistic approach and as some may attest a gun in the hand is worth more than a cop on the phone.
If some mongrel invades my home at oh-dark-thirty I want to be able to neutralise the threat to me and mine (while the wife is on the phone to the cops) but politically and legally I'm in trouble if I start brandishing firearms around and threatening people ..... and I'm in deep doo doos if I pull the trigger.
I want to be able to say "Your Honour, I heard a noise and assumed it was that rascally roaming dog come to worry my stock (or that pesky possum playing in the tree outside my window) so I grabbed my shotgun to deal to the little beggar and found myself unexpectedly facing a burglar/home intruder. I didn't intend to present a firearm to an intruder, I didn't realise some goblin was invading my home, but when you're faced with a goblin and your hand is full of shotgun, what are ya gonna do?"
That argument (shaky though it is) is more likely to fly if I'm holding a relatively innocent looking SxS .... just like Grandpappy's duck gun .... rather than an "evil black high capacity pump action assault shotgun".
So .... if, like me, you favour a SxS for HD duty then any of the coachguns commonly available will do the job .... while a 6 shot pump might do the job better, the first rule of a gun fight is bring a gun .... and a coachgun is better than none at all.
You really need to work out what loads will work best for your situation ... that means time spent at the patterning board. Some people prefer slugs, others prefer buckshot, some use birdshot. It depends on the expected shooting distances. An experienced person I respect suggests taking the longest possible shooting distance inside your home + 1 yard and pattern different loads at that distance.
As a rule of thumb the shot string will spread around 1" for every yard of travel. So at a range of 5 yards your shot spread will be around 5". At that sort of range even birdshot will pack a fair punch, but birdshot (particularly once its spread) will not penetrate heavy clothing like fewer heavier pellets will.
I would suggest buying a case or two of light birdshot loads and have some fun with your coachgun ... go plinking - reduce some stationary clays to powder, blast a few gallon milk jugs full of water, plaster some rats around your local dump, whatever. If you can try some of the clay games. The more you use the gun the more familiar it will become. Pattern some HD loads ... low recoil buck or heavy bird shot. Become familiar with what the gun will do.
A coachgun can be an effective HD tool, but its not a magic solution ... simply buying one and sticking in your closet is no guarantee you're going to be safe.
The Stoeger silverado is a robust and effective double barrelled shotgun .... there's no reason it can't protect you and yours (and look pretty spiffy at the same time). I would suggest that if it fits your situation, then go ahead and buy it .... but take the time to get familar with it now, before you find yourself in a stressful situation with an unfamiliar weapon.
BTW you may wish to consider putting a butt cuff on the gun so you've got some reloads handy .... all you gotta do is grab the gun and go.