About $225, depending on condition, caliber, scope, etc.
Your rifle is a Marlin (Winchester 30-30 is caliber). Value will be based on condition, but somewhere between $225-$350 for Good to Excellent. Great little deer rifle.
A model 336 .35 caliber Marlin in good condition can be sold/purchased for anywhere between $225 - $350.00 (better condition better price).
Average condition 225-275 depending on engravings and such
A .177 caliber air rifle has very little recoil.
.223 caliber or 5.56mm.
No You could build a rifle in .306" or any other caliber but you are likely referring to 30.06. A 30.06 rifle is referred to as "30 Caliber" but to be accurate it is nominally .308"
Yes, I can. A Barrett M107 is a .50 caliber sniper rifle.
A 5.56mm is the same thing as a .225 caliber. If you do the math, a 30 caliber is MUCH bigger!
The Dragunov (note corrected spelling) sniper rifle is in caliber 7.62x54mmR. This is the same caliber at the Moisin-Nagant 91/30 rifle.
50 caliber
It is .22 caliber- gauge refers to shotguns. In very good condition, prices run about $225-$275.