Because that's what the bore measured out to.
you should pay about 300 to about 350 dollars for a Remington 243 rifle
Depends on if that model is offered in 243
Great rifle.
50-400 usd
Varmits to deer.
The .243. It's basically a necked down .308 Winchester.
That depends on the exact model of rifle.
500
No
Yes
Model dependent
That depends on the exact make and model of the rifle itself