Like the others have said, Powerbelts typically aren't the best choices for Knights. Although, I have gotten accuracy results very acceptable for hunting something as large as an elk when using the 348 & 405gr Aero-Tip Powerbelts. 90gr of 2fg 777with the 348s and 100gr with the 405s will give 2"groups at 100 yds out of my Knight USAK.

If you go to sabots, try the 300gr Hornady XTP Mags or SSTs - both shoot very well out of my rifle and I personally would want at least a 300gr bullet when shooting larger game.