Duxman,
I can't believe people have such a hard time shooting pistol-grip shotguns (shortys) as I read here.
What's the problem with shortys?
This has been discussed VERY recently over at The High Road forums, Shotgun area, under the thread "Anyone have a Mossberg Cruiser .410?" There, we have one guy very much FOR pistol-grip shotguns (yours truly) and one very much AGAINST them.
Read the thread, you decide what's best for you.
But I'll say here:
1. Pistol-grips "shorty" shotguns are just as accurate as longer ones. If he/she can't hit anything with a shorty then a shorty isn't for him/her. But really, it's not hard at all to hit what you want to with a shorty, especially since it often will be used at close ranges...unlike hunting high-flying geese. It also would be good in bear country for backpacking. And SD in the home/apartment. A good solid hit in the torso with a shotgun is better than any caliber handgun hit, so long-stocked or short-stocked -- that doesn't matter -- the shotgun is most lethal.
2. I do not recommend having only ONE pistol grip on the shotgun. Get TWO pistol grips to put on it. Specifically, I suggest the set made by TacStar (front and rear pistol grips). Remove the rear one that came with the gun (store it away) and put on the TacStar set. They will distribute recoil to BOTH hands rather than just the rear one. If you only have one pistol-grip, the rear one -- in EXTENDED (not the occasional) shooting -- will cause trauma to your rear wrist. The TacStar grips are "fat" and so distribute recoil over a larger surface area. Further, both grips are at THE SAME ANGLE -- since they are a matched set -- which also is important. You also must hold the gun in the proper position when firing it to be sure to distribute recoil to both hands as equally as possible.
3. In your situation of tight-confines, a "shorty" shotgun is excellent. Also in that apartment situation, using birdshot (even "Skeet" ammo) is best in order to avoid over-penetration through walls which might injure bystanders. Distances to the target will be close and so birdshot will work fine. Additionally, you can get birdshot ammo that is on the softer end of the recoil spectrum...using buckshot or slugs is the max kick-ass ammo (and recoil) you could use...not required or necessary in a SD situation inside a small or typical apartment. Or, get some "reduced recoil" ammo as others here have suggested. Or, use those "shorty shells" from Aguila...but BE SURE your shotgun will feed them...some can't.
4. How you hold the shotgun as you search for intruders is also important so it doesn't get grabbed away from you...get your tactics down....you shouldn't let anyone get that close anyway. You want it pointed downwards, too, not up like in the movies. Research all this.
5. Unless you are pretty sure of yourself, I would not advocate "hunting" for an intruder in your apartment/home...if you are alone, set up an ambush and let the intruder(s) come to you. Wack them all. If you have family, gather them together and wait for the intruder(s) to come to you. Wack them all. Call 911 first, but you have to deal with the situation yourself until police arrive.
Again, tactics are one half of the SD situation, the gun you choose is the other half. One half alone doesn't improve your chances of survival.
So work out a plan. I can't cover all the points here...you do the research.
But the main thing is a shorty shotgun is almost perfect for tight spaces, and for use from inside a car, too. I carry my shorty (Mossberg 500 Cruiser 12-gauge with TacStar pistol grips) in the car, but it would do just as well in my apartment. But for apartment use, I have a full-stocked shotgun (Mossberg 590A1 MilSpec) partly because it's a large space. As for ammo, I have bullet-proof walls so I could use WHATEVER in it without fear of overpenetration...I just need to mind the ricochets.
Good luck,
-- John D.