Controlled Round Push Feed?

Gangly · 02-08-2007, 07:52 AM

I know of Controlled Round and Push feed, but what is the difference between those two and the Controlled Round Push Feed action recently utilized by Winchester?

G2 Shooter · 02-08-2007, 09:56 AM

Hopefully I will get this right.

Controlled Round feeding is when the bolt captures the next round in the magazine and pushes it into the chamber. The round has to move up into the face of the bolt. You cannot single feed this system without pushing the round down into the magazine well and cycling the bolt.

Push Feed sytems do just that. They push the next round into the chamber without really guiding it. The bolt face does not hold the case at all. You can drop a round in and just push the bolt home with this system.

Winchester's CRPF system used the best of both systems. You can single feed the rifle or pull one from the magazine. The front of the bolt captures the next round in a linear motion and then guides it into the chamber. I have this system in my Winchester Super Shadow and it works very well.

ranger140892 · 02-08-2007, 10:04 AM

Controlled feed means that the bolt face is recessed at the bottom, allowing the cartridge head to slide under the extractor before the cartridge is released from the magazine. It just means that you can chamber a round with the rifle in any position without the cartridge falling out of the receiver. It works fine but isover rated. 98 Mausers are built this way, and of course some Win mod 70's & Ruger 77's

Push feed just means that the bolt pushes the round forward and up, out of the magazine without actually grasping the head. The extractor doesn't engage the cartridge head until the bolt is closed. So, if you're holding the rifle upside down while chambering a round, (when will you ever do that?) the cartrdge will fall out.Remington 700's are built this way.

Gangly · 02-08-2007, 10:42 AM

Quote:

ORIGINAL: G2 Shooter

Hopefully I will get this right.

Controlled Round feeding is when the bolt captures the next round in the magazine and pushes it into the chamber. The round has to move up into the face of the bolt. You cannot single feed this system without pushing the round down into the magazine well and cycling the bolt.

Push Feed sytems do just that. They push the next round into the chamber without really guiding it. The bolt face does not hold the case at all. You can drop a round in and just push the bolt home with this system.

Winchester's CRPF system used the best of both systems. You can single feed the rifle or pull one from the magazine. The front of the bolt captures the next round in a linear motion and then guides it into the chamber. I have this system in my Winchester Super Shadow and it works very well.

Yeah, the WIn CRPF is what im interested in learning about. Trying to figure out what makes it so special over the PF or CR.

Does anybody have a piocture of what the bolt face looks like on the newer WIN CRPF systems?

mauser06 · 02-08-2007, 11:09 AM

got a funny story about CR. first time i went to shoot my mauser 98..it has it. dad and i had no idea...we were new to mausers and dad never seen anything like that..hes not big into hunting guns and sticks with what he knows. well..dad says load one round and fire when your ready..ok drop a round in the chamber and goto close the bolt like i was used to..daddd this thing wont close. couldnt figure it out. we ended up jamming it in there pretty good. we took the bolt out and took it to the shop and got it out..and the owner said maybe bad ammo? so he took cycled the whole box through...hes like its fine? then he asked if we tried to put the 1 round in the chamber...bingo!! lesson learned lol

bigbulls · 02-08-2007, 11:14 AM

A controled round feed bolt can, of course, feed a cartridge even if the gun is up-side-down.Most havea massive non rotating extractor that will pull the most stubbornly stuck cases from the chamber. The downside to them is that you can not drop a round into the chamber and close the bolt with out possible doing damage to the extractor they muct be fed from the magazine so that the rim of the cartridge can slide up under the extractor. These designs also use an ejector at the rear of the receiver insteaad of the plunger on the bolt face like a push feed bolt. This type of ejector is prefered by many becasue it will throw a spent case a long ways depending on how forcefully you work the bolt.

A push feed bolt can single feed cartridges because the exctactor moves and is able to "pop" over the rim of the cartridge. The downside is that they aren't as strong and can not pull some stuck cases from a chamber. The plunger tupe of ejector used on the push feed bolts applies pressure to one side of the cartridge head thus causing improper case to chamber alignment and has the same ammount of pressure regardless of how fast you work the bolt so it basically throws a case the same distance every time.

The controled round push feed is able to do both. The cartridge slides under the extractor when fed from the magazine and is held in place securly but it the shooter is also able to drop a round into the chamber becasue the bolt has a moveable extractor which pops over the case rim. This design also uses the fixed position ejector at the rear of the receiver.

Briman · 02-08-2007, 04:00 PM

Win mod 70s and 1903 springfields are similar to the mauser design wit the exception of a coned breach and a slightly different placement of the 'fulcrum' on the extractor that allows the extractor to snap over the rim like a push feed.

IMHO, controlled feed rifles are way overrated. CRF-pushfeed rifles are far superior.

Swampdog · 02-10-2007, 10:32 AM

I like the controled round feed myself.Guess thats why I like my Winchesters.I had an old buddy of mine told me once if you ever go after something that will bite you ,you better have crf.

I guess that stuck........LOL