First you have to know what you are shooting. Then you have to know how close you plan on getting to the victim. If it's a bear, you want to be close range, so you don't need a high powered scope. If you are hunting deer from three hundred yards away, you'll need the best scope you can get. There is no set number depending on what gun you have, it's all about what you are shooting. Since both calibers are very versitile, you might want to get a variable power scope. I have a Winchester 1917 30-06 with a 4X~ 12X that works over a wide range of applications.
I'm not quite sure about the 3006, but I know that the longest recorded kill shot with a .308 was at about one and a half miles, possibly more.
4x, 1-4x, 3x9 are all candidates
Assuming that your scope is a 3x9x40 scope,then medium height rings will do the job.If it is a 3x9x50mm scope,then you will need a set of high scope rings.
NEVER FIRE AMMUNITION IN A WEAPON NOT CHAMBERED FOR IT!!!!!!!!!!!! Danger, Danger, Danger,#@@@@@@@@@@@@@@@@@@@@@
Yes 3006, 270 is a long action 308, 243 is a short action.
Yes
Yes
The best you can afford.
175-250 dollars.
$650, plus scope.
Bushnell
100-550 or so