RE: Difficulty loading my Omega...WHY???
What did yu use to get the packing grease out of the barrel?
What did you use to remove the barrel oils & solvents when you stored the rifle after you cleaned it & before you took it to the range?
You need a harsh cleaner to remove the grease. You should use rubbing alcohol to remove storing oils. Failure to do both could lead to a sticky bore that appears to be clean - but remains difficult to load a bullet because the bore is tacky.
If you did all the correct things to ready your rifle, call T/C by phone ( tel# is in your manual). Tell them your bore is too small & they will want you to return the rifle by Fed-Ex. If it's too small, you'll receive a new barrel free of charge.