I haven't shot the Shockwaves, but I have shot 340 DC, 300 Nosler Partions and 300 SST by Hornady in my Omega.

340 DC, 100 gr T7 Pellets, 100 yds, 2 inch groups
340 DC, 110 Loose T7, 1704 FPS avg (3 shots) 20 yds
300 gr Nosler Partion, 100 gr T7 loose,1748 FPS Avg, (3 shots) 20 yds
330 gr Hornady SST's, 100 gr T7 loosee, 1758 FPS Avg, (3 shots) 20 yds
All shot reasonably well for me. All in the 2-3 inch size groups.
I sailed a 300 gr SST over the chrony at a 100 yds last weekend and it registered 1558 FPS at that range. Using the Point Blank program that turned out to be a BC of .240 with over 1600 FtLbs Energy at 100 yds.
Using that load for the SST's I got about 2 inch groups at 100 and 3.5 - 5 inch at 200. Pretty windy day and maybe some shooter hicups to explain the flyer the main group (3 shots)was under 3 inches.
Cheers,

Aaron