NO! The .22 mag case is larger in diameter than the .22 long rifle case thus the chamber of a .22 mag gun is too large for a .22 long rifle bullet. If the bullet does fire, the case will split with unpleasant and innaccurate results.
NO NO NO! Only shoot what the rifle is chambered for and so marked.
No. .22 Magnum and .22 Long Rifle are not interchangeable.
.44 Long? Check your cartridge again. As for your question, whatever you have, I'm almost 100% certain it won't be compatible with a .44 Magnum firearm. The only cartridge backwards compatible with the .44 Magnum is the .44 Special, and even that has limitations. .44 Special can be fired in a .44 Magnum revolver, but you need to check with the manufacturer before attempting this with a rifle, as the rifle will have a headspaced chamber.
No, they are different sizes.
22 Long Rifle
IF a rifle is chambered in caliber .35y magnum, yes. Among others, Marlin made a lever action .357 magnum rifle.
First, it is Harrington & Richardson. Second- it depends. What is marked on the gun? H&Rs were made in .22 Short, .22 long, .22 Long Rifle, .22 Special, .22 WRF and .22 Magnum.
.22 Long Rifle bullets...
No, My grand dad gave me one. as the kid I am, I tried this before . The .22 magnum is to big to fit in the gun.
No. A .357 Magnum revolver (not an automatic, lever action, or anything else with a headspaced chamber) can fire .38 S&W Special ammo, but not .38 Long Colt.
If you mean a Remington 512 X Sportsmaster, no. It is for .22 Short, Long, Long rifle cartridges. The .22 magnum is longer, larger in diameter and more powerful.
Your rifle should be chambered for .22 Magnum. As such, the chamber is too long and too big for .22 Long Rifle and, if the shell will fire, the case will usually split. Not recommended.