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No. .22 Magnum and .22 Long Rifle are not interchangeable.
It is possible
100-1000 USD
It depends... some revolvers are specifically made with two separate cylinders. To give you an example, my 1962 vintage Ruger Single-Six as a cylinder for 22 Magnum and one for 22 Long Rifle. If the revolver you are referring to only has a 22 Magnum cylinder, then No, you can not safely shoot 22 Long Rifle cartridges in it, as the cases will rupture in the cylinder, and result in hi-pressure blow-back gases.
50-500 USD
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.
There are revolvers made with 2 cylinders that can switch back and forth between LR and Magnum ammo. However, those have a barrel bored to magnum specs. Simply adding a magnum cylinder to a 22 LR is not safe.
Model indicates a particular design by a particular maker. In the case of the Marlin/Glenfield Model 25 rifle, it is a bolt action rifle in caliber .22 Long Rifle. It has a 7 shot box type magazine. The Model 25M is in caliber .22 Magnum
It can fire .22 Long Rifle, .22 Long or .22 Short. It CANNOT fire .22 magnum.
Winchester model 275 is a .22 cal. magnum (WMF) slide action rifle. It is identical to the model 270, which is chambered for standard .22 cal. short, long and long rifle. Though no longer in production, it is following its predasessor, the model 61 as a sought after collectors piece.
The convertible model has 2, otherwise, they come with one.
Your description is badly incomplete. Assuming you have a Tanarmi revolver with both a Long Rifle and a Magnum cylinder, value is about $175 for one in excellent condition. These were not high dollar guns.