Sorry for chiming in late.
I have been busy a bit doing...guess what? Shooting at 1k!
I will post pictures of my setup soon.
Scope is more important than people think, be it glass, click accuracy, or elevation adjustment.
Most of the work lies between the shooter and the spotter. If you can shoot sub moa and half moa groups at 100, then with a non-subsonic 175smk, you can shoot at 1k, provided you have a good spotter, and sufficient elevation adjustment in your scope.
1mph wind change means about 10" deviation. So a 3 to 4mph wind gust will throw you out of paper.
Its usually the wind that makes us dance at 1k, and elevation is not that of an issue, specially if you have your dope dialed in. I use strekok, g7 bc, and have had exceptional results in elevation. AM almost always on paper 1st shot at 600, and 800. 1k, is a bit tough, but am getting there slowly (getting 1st shot on paper).
You do not need to read below, but reading might give you some insight.
I started mainly with Remington 700 5R Milspec(24"), with a Kahles 624i Scope, 20moa rail and 20moa mount, total 40moa. I would not have needed the additional 20moa of the mount (scope tould have had 16mils still, good for 1200 or so), but only had that rail and that mount at the time! This meant that the scope now had about 22mils of elevation available. And was a bit high mounted too. I always use factory loaded 175smk, that gives about 2640 fps in 75F. http://www.czfirearms.us/index.php?topic=82073.msg602528#msg602528
I used Harris 9-13 non-swivel bipod, and a caldwell rear bag.
I shot 1000yards thrice, twice in matches, and once in practice. I will not like to share match results or pictures, as my spotter blew it for me. Bad wind calls lead to a wide horizontal spread and a few wash outs.
In the last practice session with this rifle, I shot a 9" group of 5 shots at 1k. It was low and left, as we could not see bullet holes, and was near sunset time. Sea level, standard pressure, 77 F. I could see in my scope that the splashes were behind the target, but could not be sure where the bullets were placed.
Anyways, back to point. You need to address 3 things first.
This is a sub 0.5MOA rifle with the loads I was using. I can get 0.3MOA occasionally, under 1moa all the time, and usually around 0.6 MOA, mostly due to my errors. I am using factory ammunition, and not reloading.
The scope is top notch, check out the results in PRS blogs, as k624i gets top marks for mechanical accuracy. Glass is quite good, not as good as Vortex Razor 2nd gen 4.5-27, or Schmidt & Bender PMII 5-25, but very good overall.
The ammo section needs a bit of work. I will need to reload for more & better consistency.
I have now upgraded to a custom rifle (FTR specs). I will post a review soon hopefully. It is almost cheating compared to the Remington 700 5R.