Impossible to answer without a DETAILED description of ALL markings.
What is the value of a 03 a3
what is the value of a good condition .243 reminton model 7400 with a VX 1 2.5 x 7 leopold scope.
about $250 in clean condition
100-400 USD
100-400 USD
Remington's website states manufacture started in 1981. Call Remington.
Yes you can. I have shot some in my dads Rem 7400. If you do shoot it. treat it likes it is corrosive and clean the gun promptly and properly.
All rifles or reasonable caliber are going to have recoil, I would look at your mounts or scope. tighten up your scope rail
300 to 500 depending on condition and accessories. The rifle can be replaced for under $500
The Remington Model 742 was made from 1960 until 1980, and it was replaced by the Model 7400 in 1981.
100-425 dollars