Re: 1000+ yd. 30 Cal. bullet weights
TexasTH, I would suggest against the Barnes bullets for LR shooting. They would not expand at the low impact vel. Better choices include the Poly tipped bullets like SST/interbond, Nosler BT/accubond, Amax, and Sierra Matchkings.
Also, at long range, wind is your biggest enemy. The light bullets (under 200gr) simply get blown around much more at 1000yds. Compare data on a ballistic program and you will quickly see that you can't go fast enough with a low BC bullet to keep up with a high BC bullet at moderate speed. This is graphically illustrated in the real world.
I would suggest a bullet of 200 gr to 240gr for LR work. They will hit significantly harder and retain their vel much better. Their wind bucking ability can be as much as 40% better when compared to lighter bullets. Flat trajectory is irrelevant as we dial up for the distance. Having the bullet bounce around an extra 6" can lead to a long tracking session.