I'm a little bias since I am the learning from the guy below.
Not exactly what you are looking for but the 6dasher is the King of benchrest competition currently. Won more 600-1000yd. national titles than anything else this year. Cleaned up in the spring at the 600 and 1000yd(Terry Balding, Richard Schatz, and Robert Hoppe?? if memory serves couldn't find the article ). nationals in california and did it again in St. Louis at the IBS 600yd. nationals(Richard Schatz).
I got to see his targets in heavy and light gun. He uses the same rifle. The smallest group was .9" and the largest was just over 3". He maintained these groups for almost 90rounds and two days through the course of the match.
The dasher is a improved br case so fireforming is needed. It typically loves RL15 or Varget in the 30-34gr. range. It will send a 105 at 3000-3050fps. It has the ability to shoot in the .1's with very little tuning. However good quality brass is the key. It has amazing ability to agge. or consistently group well. If you are competing with it, and competition is close you barrel life might be in the 2-2500. But in the beginning when Richard used it when no one else did he could get more rounds before rebarrelling. No custom dies needed I bought a redding FL bushing die set for $200.
Richard started using it in 2001 and was the first in competition:
Been in the top 5 rankings since he started
2008 NBRSA 2gun National title 1000yds.
2010 IBS 2gun National title 600yds.
2012 IBS 2gun National title 600yds.
10 World Records in IBS and NBRSA
Richard and Sam Hall have passed this trophy back and forth for five years I think. Sam also uses a dasher if memory serves me. If you know any of them ask.
The benchrest bunch are the most helpful people I have ever met. Not to many will disclose helpful hints on success when they know you will be competing against them the next day.
Brent