RLH some good info there, but since I know you're fond of your M70's I'll give my opinion of the 700's. I hope you aren't comparing you pre '64s to the new 700's! Thats like comparing a Rolls Royce to a Toyota...
Unless you are looking at buying an older remington, pre 1982 you can open the bolt with the safety on, if you have a pre '82 you can send it to Remington and they will fix the safty for free.
Winchesters can go off as well if there is any pressure what so ever on the trigger when you flip the safty off... All though remington has had some problems with this in the past I believe all the accidents were due to the pre '82 safetys
The extractor on the M70 is in a totaly differnt animal than the 700. M70 extractors are copied from the mauser action, which were designed to work in battle under virtully any condition... much like elk hunting
But M70 extractors can snap off since they are forged, and finished, instead of machined, making the steel "brittle" Luckily a replacement that has more "spring" in it can be found and replaced for about $90 if you really think you need one. This is highly unlikely to happen but it could.
Since the M700 extactor is part of the bolt face its pretty unlikely that it could snap off, but on the otherhand the 700 extractor only contacts about a third of the rim area the 70 extractor does. Again for about $70 a sako style extractor can be put on the 700 to make it much better. I have never seen a M700 fail to extract a round however... seen them fail to fire numberous times in differnt rifles in cold wet weather though. I have never seen a M70 fail to fire in the same conditions.
The triggers on a M700 are fully adjustable for pull and creep. I have never adjusted a M70 trigger but can adjust a 700 tirgger in about 10 minutes. Factory triggers are ajustable down to about 2 pounds, and set from the factory with a seal on the screws at about 5 lbs. No spring cutting needed just a screwdriver if you want to adjust it...
As far as feeding... I personaly like the 70 better, all though my gun cabinet doestn't reflect that... With the 700, you have to push the bullet against a ramp (sometims damaging your bullet tips, unless you take it to a smith for minor work) to get it to feed, where as on a 70 you pull the bolt back and the cartrage engages the bolt and you push it into the chamber. The 70 has a much smother feeling action as well.
The only down side to the CRF is the bolt face has a cut on the bottom of it, creating a "weak" spot so to speak. Where as the 700 has no cut out on the bolt face but a full rim all the way around creating a more "stable" platform. Thats why a lot more compition rifles are built on the 700 than on the 70. Either one will shoot MOA though...
All in all either one is a fine action... But both Remington and Winchester has been putting out some dogs lately. The quality controll is not what it used to be. Both factory rifles should shoot equally as well...
Personally I would not get the tupperware stock on either one, but would rather get the laminated version, wood, or get an aftermarket, such as a Mcmillin, H.S. Precision etc.
I'll tell ya what I would do though, get a M70 Pre '64 300H&H or 300 win mag and forget about it
Ivan