I would have to say that there is no "BEST" extractor set up I like
any extractor that works and is properly installed.
I always hear of the problems that people have with extraction and
it is allways because something else was wrong,some common causes
are ,loads are to hot,poorly installed,wrong bolt face dia.for the round.(
Normaly to large allowing the round to slip out from under the extractor),
Dirty chamber and a dirty or brassed up bolt face, ETC.
As far as a Remingtion extractor being problematic I have never had or
known anyone that has had a problem with one that was taken care of
but I have herd of sako type extractors popping out of the bolt but they
were improperly installed.
One reason smiths dont install Remingtion extractors is the special tooling
required to cut the excentric grove in the bolt face.
The sako and M 16 type are easy to install so that is the norm if you have to
open the bolt face up.
I prefer push feed over controled feed because I can single load without
pushing the round down in the magazine taking a chance of damaging
it plus it takes longer than just laying it in the receiver and closing the bolt.
As far as custom actions .They are great looking and are (Normaly) near perfict
But as a picky gun smith I will check every action for trueness before installing
it on a barrel and doing what ever is nessary to make it true no mater who makes
With that said it all boils down to what you want/like and are willing to pay for.
If your starting from scrach and do not have donor rifle then start with a custom
action if you can afford it ,but any action can be made to shoot accurately with
a quality barrel (The single most important thing when building a accurate rifle).
Just my opinion
J E CUSTOM