A heavy rifle does not kick as strongly as a light rifle because its greater mass helps absorb and dissipate the recoil energy generated when a round is fired. The increased weight reduces the acceleration experienced by the shooter, leading to a softer perceived recoil. Additionally, the heavier rifle's design often allows for better stabilization during firing, further mitigating the effects of recoil compared to a lighter rifle using the same cartridges.
Some are heavy, some are light. It is a fairly mild cartridge, and does not require a very heavy rifle. Weight will depend on the specific make and model.
ALL other things being equal (caliber, type of action, etc) a lighter rifle will have more recoil (kick) than a heavier one. It is a matter of action and reaction. I have a heavy (11 lbs) benchrest target rifle in .308- it is a pleasure to shoot. I have another .308- a lightweight hunting rifle (6lbs). With the same cartridge, it will put tears in your eyes!
Never change components unless a proven manufacturer who publishes reloading data has tested it.
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Equal and opposite reaction. With a heavier firearm, recoil is trying to overcome the greater inertia of a heavier mass.
Not really
@ 4kilos
152 pounds without the rifle
If you rifle is a slide action repeater (pump rifle) these DO have a collector's value. It will be based strongly on the condition of the rifle. It could vary from $250 up to $800 for VERY good condition. Strongly suggest you not attempt to "clean up" the rifle other than a wipedown with a soft oily cloth. You WOULD need a hands-on appraisal.
Heavy Barrel
rifle barrels may have a different external diameter. A rifle that is carried for hunting will usually have a "sporter" barrel- slender, to save weight. Target rifles will have more massive, stiffer barrels for accuracy. Those are "heavy" barreled rifles.