In general, no. Unless the gun is marked for 3 inch (or even 3 1/2 inch) shells, you should not attempt to fire 3 inch Magnum shells, even if they seem to fit. However, if you have a gun made for 2 3/4 inch shells, and have 2 3/4 inch "magnum" shells, IF your gun is safe to shoot, it should be safe to shoot those "baby" magnums.
Yes, you can safely shoot a .38 Special cartridge in a .357 Magnum revolver. The .357 Magnum revolver is designed to handle both .357 Magnum and .38 Special cartridges.
Yes, it is safe to shoot .38 Special ammunition in a .357 Magnum revolver. The .357 Magnum revolver is designed to safely shoot both .357 Magnum and .38 Special ammunition.
None. While there are firearms made to shoot .45 Colt AND .410 shotshells, they are designed and made to do that. A regular .410 shotgun is NOT made to do that safely.
Yes you can you can shoot 3 or 2 and a half in
A 41 magnum caliber revolver will shoot 410 gauge shotgun shells but is not recommended. The shot will lead the barrel rifling. There are also adaptors you can put in a shotgun that allow you to fire pistol/rifle ammunition.
NO. 2 different cartridges. Not safe to attempt this
NO. .22 Magnum has a larger diameter case than .22 LR. The LR case will split.
A .357 Magnum can shoot .38 Special rounds as well as .357 Magnum rounds.
http://www.wikihow.com/Shoot-a-Shotgun
Not safely. Despite the tales you have heard about this, the pressures of a .44 Magnum are well above the design pressure of a .410. WHEN (not if) the gun fails, someone is going to be hurt. No. Don't.
NO. A ,357 magnum may safely fire .38 Special, but not the other way around.
Yes, shorter shells are no problem.