I have a 700P in 338 LM. The only issue I have had was a weak ejector spring.
It spits out a pretty large piece of brass which obviously will not eject as far as
smaller brass. Mine was just kind of lobbing them over the side so to speak.
I replaced the spring when I had a tactical bolt knob installed and have
not gotten it back from my gunsmith yet so I don't know if it has improved the situation.
Other than that issue, if it turns out to have been an issue, I have been very pleased with mine.
It's pretty accurate way out there, about 3/4 minute at 600 yards so far. I'm still playing around with the best load combination for it but so far its worked very well. When I get my round worked up I will take it out to 1000 yards and see what it does. Even then a grand is really not pushing it's potential.
I don't really like the palm swell that the P stock has and will probably put it in another stock eventually but it has not been an issue with the rifles performance. I agree with you in that I don't think Remington would put it out there if it were not a good piece of equipment.
When I researched it prior to buying I ran into some of the reviews your talking about from the I don't know but I heard from someone crowd. According to the Google Fu network a 308 has a barrel life of 5000 rounds. The guy who taught me to shoot has a documented 24000 rounds on his 308 and it still shoots a grand accurately with no problem. It's really troublesome when your seeking valid information from someone that knows but yet have to wade thru the crap from that bunch. Good luck with it, it's a great gun and a really fun caliber that will set off car alarms. Let me know how it works for you.