Controlled feed uses the extractor to control the round from the magazine into the chamber.(Mauser type action) Push feed simply pushes the cartridge loose from the magazine and lets it fall into the chamber (Remington 700 and Savage type) Of course it is debatable, but traditionally most dangerous game hunters believe the controlled feed action to be a necessity.
You need a barrel nut wrench. You can either grab the action with a vise or an action wrench. To me, it is easier to work on a Savage without it being locked in a vise. Grab the action wrench in one hand and the barrel nut wrench in the other and work with the action free. You can do it either way, but to me the latter is the easiest method.
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