The Omega is a good gun. It's also BH 209 friendly, and should shoot it good with no mods. The bullet you picked is a good one, and should shoot good in your gun.

So, I would suggest you use BH 209 in 90-110 loads. See which load is the most accurate.

Make sure the bore and breech plug is clean and dry of any oil. Swabbing with alcohol before shooting will get rid of any oil. BH 209 requires no swabbing at all while shooting. Even if you shoot 75 shots, or more.

After shooting clean the barrel the same as you would a CF gun. Use your favorite solvent.

The flash channel should be cleaned with an 1/8" drill. Just hold it by hand, and twist it in until all the carbon is gone. The flash channel is the channel under the primer pocket. Clean the rest of the breech plug with the same solvent you use on the bore.

Use a hot primer like the CCI 209M.

Have fun.