Just reading the F-tr faq sticky and his observation that the 168 gr. SMK is only good to 600 yards before it becomes unstable. If one wants to reload in order to be shooting out to 1000 yards with a factory Remington 700 Varminter (1:10 twist)...what bullets might one recommend?
Lots of advice above, but nobody seems to be discussing what kind of chamber it is that you have.
I've been running 185 Jugs for the longest time, and at first blush, I'd advise you to do the same... The problem is I have a custom reamer that is used to chamber my barrels and it was developed for me specifically for the 185 Jugs seated with the base of the bearing surface just forward of the neck to shoulder junction on my brass.
It sounds like you have an un-modified factory rifle and chances are a much shorter throat. With that in mind, you will be much more limited and may not find success using what works for a guy with a custom chamber like mine and probably the guys above. Chances are that you will jam the lands with a much shorter overall length and will not be able to develop loads that run at similar speeds.
I suspect that you will find best results with shorter lighter bullets because of your chambering.
I would suggest that you figure out what kind of seating depth you will get with a range of bullets and consider where the base of the bearing surface is relative to the neck to shoulder. Until we have some dimensional numbers, we collectively cannot provide actionable advice.
I would start with Sierra 155 Palma and work your way up in bullet weight from there and you'll probably get no heavier than 175s. If you end up with most of the bullet down inside the case, it will cost you powder capacity and your velocity will drop. Then you'll need to work out the ballistic numbers to see what works out best for you down range.
As a general rule, you'll want to shoot the heaviest bullet you can with the highest BC, but considering your throat you may not get good results with what the other guys are using.
In the end, I would go with what produces the best 100 yard accuracy and play to your strengths. You'll probably do well at shorter distances and in light wind conditions where the high BC of heavier bullets the other guys are using will not provide much of an advantage.