controlled vs push feed

gotstolefrom

September 24, 2004 07:42

It really doesn't matter much, but can someone give a 5 line or so response to define the difference. I know what I see to be the difference, and it has become a curious discussion around the Hoppes bottle.

If we do not hang together,
We will most certainly hang separately.

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  JustC

  September 24, 2004 08:03

  in a push feed action the casehead is simply pushed loose from the follower and up the feedramp into the chamber. In a controlled round feed action,..the rim and extractor groove of the case are actually fed up behind the "claw" of the extractor (which you see running along the bolt body) and fed into the chamber under the "control" of the bolt which now has a secure grip on that case. Controlled round feeds will feed ammo upside down or sideways or whichever way the rifle/shooter happens to need to do so. The push feed having no grip on the case prior to entering the chamber would allow the case to fall out if worked upside down or at a great sideways cant. Controlled round feed actions have been a favorite of Dangerous Game hunters due the fact that they feel they have eliminated the possibility of having a charging animal coming after them and their rifle fail to feed the next round from a push feed action when short cycled in the heat of the moment. The CRF action has to be fully cycled to eject the spent case,..therefore it's positive ejection and firm grasp on the next case make it a little less "nervous accident" proof.
  
  Then there are the differences which handloaders and benchrest shooters see,...making the push feed more desireable due to long seating bullets to single feed and engage the rifling lands.
  
  why chase the game when the bullet can get em from here?....
  Got Balistics?

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  rufe-snow

  September 24, 2004 08:04

  With controlled feed, as the bolt goes forward, the cartridge is fed up from the magazine under spring pressure. The base/rim of the cartridge is held/caught in position between the face of the bolt and the rear surface of the extractor.
  
  With push feed the extractor doesn't snap/catch the base/rim of the cartridge, until the cartridge has been completely chambered and it's forward momentum has stopped.
  
  

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  Ray Boone

  September 24, 2004 20:09

  There are two features of the controlled feed that I prefer over push feed; at least when the rifles involved are M70 Win Classic and Rem M700. 1. To empty the magazine by running the cartridges through the chamber, the cartridge needs only be pushed forward enough to pop-up from the magazine, then pulling the bolt back ejects it- compared to the pushfeed, where the cartridge needs to be completly chambered and the bolt handle turned down to snap the extractor over the rim. 2. the extractor on the M70 gets ahold of about twice as much rim as that on a M700.

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  plains scout

  September 24, 2004 20:38

  Had a controlled feed M70 Win and gave it to my son. I wish my Weatherby Predator had control feed. Just smooth and positive.
  
  
  
  "America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."
  ~Abraham Lincoln

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  ZERODIN

  September 24, 2004 20:40

  In short:
  
  Controlled feed works better and feels a lot better
  Push feed can single-feed and can be slightly more accurate, all other things being equal
  
  I prefer controlled feed. Supposedly, Winchester's new CRPF (controlled-round/push feed) can do the single-feed. Best of both worlds, supposedly - I haven't tried it.

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