I have a CVA Kodiak and it is still sighted in for 3 50gr Pellets of Pyrodox and a 240gr XTP Mag and a T7 Primer. Even with this MAGNUM CHARGE I still got it to shoot 2-3" groups at 100yds. Since then I have switched to Loose Powder and have not shot My Kodiak since I bought My ACCURA's. The Kodiak is a good shooting ML, it handled the magnum charge well and Im sure it would do a-lot better with a lesser charge of loose powder and I could get the groups down to 1 1/2" at 100yds. You did'nt waste your money on the ML, Im not sure why you cant get it to shoot well with what your using at it seems to be a acceptable load.
300gr Sabots are not gonna help you get it to shoot better, it must be you. Have you tried sighting the ML in at say 40yds first? Trying to go right to 100yds could be the problem. You have to get in sighted in at a close distance befor you go for a further one because if your not getting good groups at 40 you'll never get them at 100. Start off close then go from there.
(BP)