There are some problems with your desires...
Several of the above posts have detailed good and bad about 100 yard 177 shooting. I plink a lot at various ranges up to 208 on my range and would not depend on any 177 except with the heavier slugs at longer ranges. I shot this at 100 with a 12 ft lb Steyr and 8.4 gn pellets in virtually no wind. The first 3 are touching but I could register the faintest change and held a little but still went left. On the fifth, I could feel just the slightest more change and held about 1" more and still went more left. It's a very good group and if the wind hadn't changed, would likely be all touching. To be clear here, the wind was so low, even with the felt change, didn't move my wind flag ribbons at all !
View attachment 467478 View attachment 467479 Now that was at 12 ft lb. The problem I've had has been stability. My wifes Red Wolf would likely do this in good conditions with 16.1s at 33 ft lb but they seem to go unstable somewhere around 85 yards. It can get sub moa for a lot of the shots but the ones that fly are really bad. These represent to me the best long range option because they are heavier and the best bc... just can't get them stable for that kind of distances. Now I've seen 10.3s and 13.4 MRD's stay stable much further but they blow a lot more in the wind so they are MUCH more difficult and critical to judge wind with.
All I'm trying to portray here is that though the 177 CAN shoot in really good conditions @ 100, trying to do that in any kind of wind will be quite difficult. It's already difficult enough with pellets that are twice the bc !
Now slugs might be a different matter. I've documented my fun with the 20 gn NSA's and had them shoot well to over 200 yds. The 16 gn area slugs seem to be about the best for the 1 in 17 twist barrels though.
Good luck on your search !
Bob