Some 250 grain Shockwaves should do the trick. Out of your Omega you should get excellent accuracy and knock down power. 100 grains of powder should be plenty, but it would not hurt to try 150 grains of pellets to see how your rifle behaves. With loose powder, 100 grains again fine, and you could push it to 110 grains and still get great accuracy and excellent performance.

There are some people that do not like Shockwaves and others that rant about how well they perform. Why some have poor performance I do not know. I have been trying to talk a Whitetail into a little product testing for two years and have yet to take a deer with a sabot. I personally think they would work fine, but again... this is not based on field experience, only what I have read and seen on TV.

Welcome to the forum... its great to have you here.