The greatest issue with the 12 bore 'riot' gun is control of the weapon.
I'll define riot gun as a short barreled pump with no choke (cyl. bore) or imp. cyl.
The very best thing a person can do is pattern the thing at the ranges one exepcts to bring it into action.
If defending life, limb, and property is your goal (watch your laws on property) then your
practical ranges might be 3 to 25
feet.
You know your home and situation, I don't.
I live in the country with no close nieghbors so over penetration is not an issue for me.
My h.d. s.g. is an 870 Express loaded with 3" mag #4 buck.
00 buck or #1 would do just as well I think. This particular weapon sports a 20" smooth bore, rifled sights, and has been smithed by a s.g. smith.
It has the forcing cone relieved, bore polished, and threaded for tubes, it wears a mod.
You need not have your barrel worked on. I'm just a goof ball that wanted to invest more money on the two barrels that came with the gun to determine if the work done was worth investing more money in the two barrels than the gun cost new!
I get 10 or better % tighter patterns. That is not a significant issue for h.d. but this one doubles as a hunting firearm.
The short barrel with sights and extra full choke tube patterns well with turkey loads at 40 yards.
Pattern your gun at the ranges you think you might have to use it.
That is paramount.
A story:
A really bad gobblin was married to a woman with a teen aged daughter, not a product of this union.
This gobblin had an impressive criminal record.
I knew the man well, in fact knew his whole family of really bad people.
It was my job to "get involved" with the criminal element. As a detective I could not learn my turf from the country club don'cha'know?
Wife of gobblin learns from her 15 year old daughter than Mr. Gobblin had been having sex with her but she said nothing out of extreme fear of him.
She had good reason to be afraid.
He was that bad a man.
I was respectufully afraid of the guy myself, quite frankly, but careful to never show fear around those kind of animals. His whole family were animals that would kill ya in a heartbeat.
Daughter finally breaks down to mommie when Mr. Gobblin isn't home and tells of years of sexual abuse.
Mommie of course is livid with anger but has better sense than to call the cops because one or more of the 'family' will get them if Mr. Gobblin doesn't.
She sends the vilolated daughter away for the night telling her to keep her mouth shut!
She confronts Mr. Gobblin when he comes home quite drunk as usual.
Mr. Gobblin admits his msideeds, then proceeds to beat the living $hit out of mommie saying if she calls the cops he'll kill them both.
He would.
He then goes to bed with his 14" single shot 12 bore, loaded with 1 1/4 oz of #5 shot. I forget the brand of ammo now.
This is normal for the pig, I mean Mr. Gobblin, to sleep with the loaded gun.
Mommie decides to run off, gather up the violated daughter and leave town and disappear.
First she decides to take the s.g. away from the passed out drunk Mr. Gobblin for fear if he wakes up he would shoot her in the back as she tries to leave.
Wise move, 'cause he would.
She quietly takes the gun by the stock and begins to pull it away from the sleeping animal, I mean Mr. gobblin, and lo and behold he wakes up, grabs the barrel and pulls it toward him and out of mommies grasp.
Fine and dandy except the gun was cocked and it went off!
Fortunately the barrel was pointed in a safe direction, right at the center of Mr. Gobblins chest!
Gobblin took the entire charge at near contact distance. We figured a mere inch or flat out contact.
Anyway the charge hit him just left of center of the sternum, angled to the right so that the charge hit to the left of the sternum, and angled to the right into the heart.
Mr. Gobblin was really, really, pissed!
He got out of bed and chased mommie across the bedroom swinging the discharged s.g. in an attempt to brain her.
Then he realized he was dead and appropriately acted as such.
I got called in from home to investigate.
I did the autopsie (yes police can do them if a coroner or pathologist is in the room in my State).
The heart and both lungs were shredded as you might imagine. The wads were lodged in what was left of the Gobblins heart. No shot passed through.
Trace metal tests on his hands indicated he did grab the s.g. barrel.
I wrote it up as an 'accidental' shooting.
The coroner and grand jury agreed.
Well you must understand the only story being told was told by the only living witness.
Case closed.
Mommie moved to another state to be with her family and got her daughter into counseling.
I went to the funeral.
After all they were friends of mine.