That depends on the exact model of rifle.
60-500 USD or so This is a pump rifle its gotta be worth more then that..
You did not tell us the MODEL or the CONDITION. We can't answer without that information. Sorry.
100-400 or so
Yes
100-400 or so
In order to answer your question correctly I would need to know the model of savage rifle that is chambered in .243 Win.and the overall condition of the rifle to give you a half way decent value.
this riffles worth 2 gramd or keep it.
100-500
100-400 as described.
NO! the 243 wssm cartridge is completely different than the 243 Winchester cartridge.The cartridge case is much wider through the body,and has a lot sharper shoulder angle which sets the headspace on both these cartridge,s.The 243wssm is loaded to a higher pressure also.In effect you would blow the receiver up and yourself if you could get the cartridge to chamber in the breech of your rifle! Do not attempt this in a 243 Winchester chambered rifle.
you should pay about 300 to about 350 dollars for a Remington 243 rifle