SB... do you own a semi-automatic? IF so... why? Is a handgun or a regular shotgun or rifle not sufficient for your needs? Do you own large volume clips... Do you believe you will have the need to fire 50 or 100 shots in seconds? If so.... why.... and at who?
QS, the lack of technical understanding makes these terms all the more distasteful to you, I can sense. Don't be offended by my saying this, please. Your career background I take to be pretty darned technical, and one not easily attained; that suggests as a young adult, "finding out" meant as much to you as getting the good grades needed academically. If these are reasonably comprehensive guesses on my part, you won't simply "write off" my following explanation:
Handguns are made in two basic types. Semi-automatic
Pistols, and Revolvers, which are made in two types, unimportant to distinguish here.
Pistols carry their ammunition supply
in a reloadable magazine, ("clip" is a red-neck, hillbilly term I don't use) which is inserted into the firearm. I have never seen a pistol with a factory-fitted magazine capable of carrying over 16 rounds of ammunition, which would be what is typically termed a "high-capacity" magazine.
Revolvers carry their ammunition in a
cylinder, a non-removable type of "magazine". Most have chambers for 6 rounds, some less, and each round must be manually inserted just as they must in a removable magazine for a Pistol. Revolvers are NOT semi-automatic.
So, if one chooses to have a Pistol, it WILL be semi-automatic, other choice present. Choose a Revolver, it WILL NOT be semi-automatic. BOTH TYPES WILL require a trigger-pull to fire EACH AND EVERY round.
Your question of a "regular shotgun or rifle": BOTH are made in the exact same designations I just described. Semi-automatic, or manually-operated.
Question about 50 or 100 rounds in seconds: Magazines ARE made which have capacity of 20, 30, rounds commonly, specialty manufacturers have made larger ones, but only for rifles. Shotgun cartridges are far too large to load large numbers and tote about.
Thanks for reading. imp