The usual question: Why do people need a 30 round clip? Why do you feel you need so many rounds? These large capacity clips simply allow a person to kill are large number of people in a mass shooting situation. If we ban them, then it will help to stop mass shootings.
Consider this scenario, since this is what the main stream media has been presenting as the reason why they want ot ban 'high capacity magazines'.
Imagine you're a deranged person, and you've decided to go and create mayhem and kill as many people as you can, for whatever reason your sick mind has chosen.
You start by planning who will be your victims, including in your plans the location and the method of your killing.
The key word here is 'planning'. You have all the time in world to pick the place and other details of your plan.
You decide to pick a 'gun free zone' so as to minimize the chance that you will run into anyone that can shoot back at you. If you choose your venue carefully, there will no on duty police, nor armed guards. Where would you choose? Probably a known 'gun free zone', so you would either choose a place with a lot of people where they post 'NO GUNS ALLOWED', or a school, which is a 'gun free zone' by federal law. You will also pick a place to not be next to a police station, or a place where police are known to frequent. You may even visit the place a few times to be sure of this and to pick a good time of day to carry out your 'plan'.
Next you take the time to gather your weapons or your other 'tools of mahem'. You can also bring as many magazines full of ammunition with you as you can carry. Fill a backpack full of them or stuff your pockets full with them if you like. As you feel there will be little oppposition to you and you will have plenty of time to walk around, shoot at people and not once have to rush to change to a new magazine when the one you are using is empty.
At this point it wouldn't matter if you had a backpack full of 30 round magazines (which are larger and heavier so only so many will fit in your backpack or your pockets) or a backpack full of 10 round magazines (which are smaller and lighter so more will fit in your backpack or pockets). If you're smarter and understand guns, you would probably chose more smaller, lighter 10 round magazines as your rifle will be lighter and easier to both carry and to aim. An experienced shooter also knows that a 10 round magazine is more realiable than a larger magazine and is less prone to jam.
The key is that since you're planning this mahem ahead of time, you have plenty of time to gather what you need and to the details about what you will do. The size of the magazines doesn't matter at all! It takes only a second to exchange an empty magazine for a full one. So if you only had access to 10 round magazines, your plan would be no different and you would probably have less potential of a jam in the magazine..
When the police were called, it would take them probably 10 to 20 minutes to get on site, gather and start their search for you. If you carried 10, 10 round magazines, that would mean that you would lose only about 10 to 20 seconds (considering 1 to 2 seconds to change a magazine) of lost time while you were walking around shooting your victims, and in fact, you could change each magazine while you were searching for the next victim, so there would be no real 'lost' time. In real practical sense, the size of the magazine makes no different to you.
Now let's consider a totally different scenario.
You're a homeowner that is asleep at night. You have a pistol to defend yourself and your family. You suddenly are awakened by a commotion outside that is someone is trying to break into your home. You only have a few seconds to wake up, grab your gun and flashlight and investigate to find out what is happening.
In this scenario, you don't have the luxury of time to plan and gather supplies, you barely have enough time to get to your gun. If you're lucky, you will get to it before the bad guys are standing over you in your bedroom.
Keep in mind that shooting a pistol is not like what you see in the movies. If you have to shoot to defend your family, especially under the stress and shock of just being woken-up, with adrenaline pumping through your veins, you may miss the bad guy! And what if there are more than one? Under this scenario, you would be very upset if you only had a 10 round magazine in your pistol, if you need that 11th, 13th, or 16th shot, you will be happy to have it, so as to be able to protect your family and have the bad guys headed to the hospital (or worse) instead of you of your loved ones.
Also keep in mind that there are millions of these inexpensive magazines already available on the common market. Any so called ban would only stop a law abiding citizen from having one. The criminals have no consideration for laws and would have all the high capacity magazines as they can cary. Remember, they have the luxury of time and of planning before they start breaking into your home! They can choose when, where and what to bring with them during their criminal activities.