Only just seen this. Excellent article Laurie and a good job that I haven't just gone out and bought 200 175gr SMKs to try at 1000 (doh!....I meant "I have").
I tried the #2155's but simply couldn't get the velocities needed at 1000 yds (I managed about 2,800 fps) and they were all over the place as they went through transonic region.
Best results to date were with the venerable SMK 190s, which on the first outing after load development put up a respectable moa at 1000 yds from a factory barrel and may have grouped tighter without the gentle, but variable sidewind.
As an aside, I am surprised that no-one yet has mentioned the newer TMK175s for 1000 yd F-Class/TR as their BC is significantly up on the older smk and they're still reasonably priced.