Depending on exact model and condition, your Remington Mdl 760 Gamemaster is worth about $400. More or less.
Remington Game master model 760 is a pump action rifle produced by Remington arms from 1952-1981. A 1981 model in good condition can cost anything around 550 to 600 US dollars. However, an older model may fetch more if the buyer has some sentimental reasons to acquire it.
$225-$600 depending on the condition.
200
The value of a 1972 Winchester model 70 270 cal is between $760 to $800. This is good condition price.
350-700
ChE = 3.2 Cal/min = 3.2 x (4.19 J/cal x 1000 cal/Cal / (60 s/min)) = 223 J/s or 223 W
Depends on condition, accessories, # of rounds fired, etc. Range of 600-900
5.56 or 223 cal.............................
No
5.56 and 223 cal. are the same cartridge...........
I believe, for the most part, cal 223 or 5.56