[HiBC]

While it is true a CRF extractor can be modified or produced to snap over the rim of a cartridge not fed from the magazine,to do so compromises the the advantages of the CRF extractor.
Engagement and tension are reduced,as is extraction power.Looking at the bolt face,engagement from 9 to 6 O'clock might be cut back.That is where the "control" of CRF lives. The round has more opportunity to escape if you shoot standing on your head.

I doubt a CRF extractor modified to snap over is any more reliable than a push feed extractor.
It gets done,and if thats what you prefer...it works.Its convenient...but any "CRF advantage" is largely illusion.

Some folks modify push feed bolts to accept AR type extractors. Whatever floats your boat.

I suggest if you are shooting at something that will bite or stomp you,load to moderate pressure so cases don't stick.
375 H+H,404 Jeffreys,416 Rigby ,etc are loaded to pressures that allow brass to spring back,and the cases have some taper.

For most of us,deer/elk,etc are someplace between meat and hobby hunting.An imagined "It could happen" extractor failure would generally be an inconvenience,not life or death.You do have a backup rifle in camp,don't you?
(If you worry about extractor failure,I suggest one,along with a spare distributor for the truck and a defib machine,spare suspenders and extra boxer shorts)

The theoretical arguements aside,I prefer CRF rifles because ,IMO,they look proper. Silly,I know.But I think a 1903 Springfield is elegant.
And I'm just not interested in any motorcycle that looks like a jet ski or an Asian copy of an anachronistic Vee twin. Anachronisms are fine...but they must have a legit connection to something.
I'd happily hunt with my Hawken...but a plastic stock stainless Rem bolt muzzle loader??Nah.Not in my elk picture. You can,though.Its cool.
I like CRF extractors with my eyes.
I get to make my gun choices on pure preference,silly emotions included.

I don't need to have a strong technical argument to convince anyone else.

It seems the silly idea of using a CRF extractor for headspacing purposes has been suggested.
I prefer a proper chamber and good ammo.

I suggest using pin gages to determine the bolt face to extractor hook dimension.Then measure rim thickness and see how precisely an extractor will headspace.

A CRF rifle won't work without clearance under the extractor hook.
As the bullet/neck feed up into the chamber,the case head is still down in the rails.As the case head rises up under the extractor,its tipped away from the bolt face.Clearance is required.Or it binds. Its a geometry thing.