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603, heavier rifles (barrels?) move slower around their aiming area when hand held. They also move less in recoil during the time the bullet goes down the barrel. They're easier to shoot accurately than light ones. This is why service rifle shooters started using heavier barrels in their M1 and M14 rifles; the skinny barrels shot just as accurate but the heavier ones produced better scores.
The physics behind this should be easy to figure out.
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