Yeah and it's way WAY fucking worse with a rifle
There's a home intruder. That person has been to the range a few times in his life. Be honest, what's his best bet:
1) handgun
2) rifle
3) shotgun with buckshot
handguns - in new/unproficient shooter's hands it is "naturally pointing". this is repeatable with nearly any shooter to get consistent hits at 7-10 yards on paper. no x rings, no tight groups to cloverleaf, but they'll be on paper, and for someone with regular (once a month) practice of a box or two each time they'll be in the black.
don't take my word for it, but observe new shooters at your local range: even people that are intimidated by a firearm and will cringe or limpwrist will be able to get that first shot on paper before bad habits kick in.
a rifle with a simple manual of arms, such as some pistol caliber carbines is even more ideal as there is no chance of a limpwrist malfunction and you have the benefit of a shoulder and more than one hand. even completely new shooters naturally grasp and point a firearm at a threat enough to be able to aim - just as one would throw a ball or spear.
Shotgun has a major advantage: it's scary as fuck and will make most people aside from hardened killer freeze in their tracks or run away in a way a rifle or handgun won't.
no. do not rely on intimidating someone who has already made the decision or possibly kill you - they have the advantage of that decision already being made in their minds. this is seen in countless defensive shootings (police, concealed carriers, et c) that the decision making process is not instantaneous and simply not needing to make a decision speeds your reaction by removing doubt.
while you have the possible advantage of surprise (many criminals do not expect resistance) or familiarity (home, neighborhood, et c); someone willing to break into a home, or someone willing to threaten someone with harm
already has an advantage on you because
they have already made the choice to commit a crime bad enough to force you to use a gun to defend yourself.
you give up surprise (by revealing your lack of immediate intention to kill, as well as your location by creating a noise) in the situation, you lose momentum (keeping the tempo and pace of action to remove possibly lethal hesitation), and you are gambling on someone else (who may or may not intend to harm you) reacting in a specific way - you may not have even seen them yet!
heck they would also need to identify the noise and recognize it for what it is, which is yet another roll of the dice.
it is very obvious to defensive shooters, police, military, and many others that you cannot rely on someone already willing to commit a felony (B&E let's say) to react in a way you can predict without eyes and force on target. feel free to google "racking a shotgun to scare burglar" and read the results.
that being said, generally an easy mark is a home not yet burgled. B&E tends to happen during work hours, when people are often away at work - less chance of encountering witnesses or the home owner. home invasions possibly have some other purpose such as a crime of opportunity, kidnapping, rape, thrill killing, and so forth. not people that are predictable enough to make a sound at and ensure they cooperate.
As far as not killing people right away or at all, that's usually what happens with ANY firearm that doesn't score a headshot (and even then) or straight in the heart. That's why the Mozambique Drill came to be.
You have tons of people pumped with like 5-8 bullets who never even realized it right away and thanks to adrenaline were able to defend themselves/kill the people they attacked
indeed people survive many things. your job, if you are drawing a weapon as lethal as a firearm, is to ensure they stop their attack - if that results in their death, so be it.
Rousseau's story, turned into a techinque (now called the Failure Drill, IIRC) i'm quite familiar with is not easy to perform as movies would lead you to believe. you must score two hits to either side of the sterum (or the sternum itself) to break, crush, or puncture the lungs to incapacitate the threat and force them to lose momentum and lurch trying to breath. with their head and/or neck presented forward more of their brain (vs the face or jaw) is exposed, and a well placed shot to the now slower more stable target should stop them from being a continued threat. i have done this technique many times.
gut shots from poor form and recoil management and a shot that misses the head from lack of practice is neither lethal nor reliably a threat stopper.
The % of Mossberg 500 shotguns who jam is so ridiculously low it might as well not happen at all compared to rifles or handguns.
read my example. the most common even to familiar shooters is user error - short shucking, or surprise at the noise/blast from firing indoors without hearing protection. that malfunction from lack of training is a sure show-stopper as any stovepipe or doublefeed.
Stop thinking like a guy in the military and put yourself in the shoes of a civvie who will 1) not go to the range often enough to become proficient and 2) needs a weapon mostly in case some deranged tranny wants to break in not an home invasion with three ghetto rats on pcp
The only sensible home defense solution in his case is a shotgun.
If he was willing to go to the range every weekend for a few hours to become really proficient AND do some training about shooting under stress when there's tons of noise and shit sure I'd suggest to go with a rifle over a shotgun
It's not the case though.
1. that's a little condescending.
2. people in the military who pass basic training qualify on specific weapons and are given the bare minimum of training to be proficient enough to pass. the amount of dumbassery and idiots i've served with, have trained with, fought alongside, and after my tour, came home and work with or see around town is far worse than many in the shooting world.
3. anyone serious about defending themselves should be serious about picking up professional training and putting in the time to practice. to do otherwise is directly saying that you are too cheap to buy training ammunition to build skills and muscle memory, and that you are too prideful or too cheap to pay for a trainer to improve your initial talents. the gun may as well be a toy or magic talisman in the hands of the willfully untrained/unpracticed.
4. any weapon adequate enough to kill one person can, with practice and training be used to survive an encounter with multiple assailants. not unscathed, but enough to get to a hospital or home, rather than a body bag.
5. the "sensible gun" is a gun a shooter is familiar with, trained with, practiced with, and comfortable with. for very new shooters, especially with modern media, that is the automatic handgun or a J-frame revolver. point and shoot with one hand (as people do naturally from a young age) and a simple manual of arms in general with less involved muscle memory hurdles to interfere with a largely "automatic" action.
6. i'm uninterested in any line of argument that seriously pushes the idea of "buy a gun, point at the bad man and pull the "go away" lever". it's a bad argument and one that has gotten people killed and put shiny unused guns in the hands of determined felons.
This is not Afghanistan or Compton and this is not someone who knows how to handle weapons
all the more reason to get every possible advantage that constraints allow.
if your life is worth defending, isn't it also worth defending to the very best of your ability? to ensure you have every possibly advantage you can attain? such as training, practice, and familiarity?
pushing a "shotgun" as a magic band aid of point-n-shoot 1 hit kill if the break in artist who perfectly hears and understands the warning noise of "shotgun" coming from the left isn't somehow scared into a blubbering pile of fear is making a lot of assumptions of character, removing advantages of the home team, and moreover relying on something blatantly untrue: shotguns are not cure-alls.
Reddit's /r/guns for my area suggests a Mossberg 500 or a S&W 1892 using .40 Magnum.
I need something that kills when it connects but doesn't pose a risk to anyone in a neighboring domicile. If you hit someone they will throw the book at you.
anything that will be lethal to men will likely penetrate several interior walls. glaser or frangible rounds are less likely to penetrate and be lethal.
#4 shot reduced recoil (or managed recoil, et c marketing names) 12 gauge buckshot will be very lethal at in-home distances and a Mossberg 500 (or a Maverick 88 if you want to be especially cheap... an IAC's Hawk 982 is decent as well at the low price points you want i think) would work as well as any reasonable quality shotgun if you are settled on one.
be very sure you practice
consider a Glock 22 as well - a .40 S&W that i'm sure local police near you use. if you use the same pistol and ammunition as the police, and you practice, and you ensure you shoot to kill if you're shooting at all, and you shot in good faith that you had reasonable and immediate fear for your life, it would be hard to "throw the book at you". i know you have a handgun already so the manual of arms would be something at least modestly familiar with and the Glock is inexpensive used, are quality made, and readily available with few controls to "get in the way" of defensive shooting.
if you want to simplify logistics, consider a Glock 17 or 19 then, and share ammunition with your VP9. defensive JHP like Speer Gold-Dots is readily available.
remember, anything you fire that is lethal, if you miss, will very likely penetrate interior walls and may escape the house and hit unintentional targets. get training and practice practice practice to avoid misses and handle yourself well.
your life and the lives of others may depend on your ability to
not fuck up.