30ptdoe
Easy questions first....
I was wondering wich would be the best to buy and if I should get it in .45 or .50 cal.
I would totally recommend a 50 cal vs the 45 cal - there are just to many options available for the 50... Another thing a recent market survey showed that the 45's may have reached their peak and may be declining in popularity. I many states especially out west the can not be used on elk and for whitetail you would have to use a true bore-sized bullet.
and also would my 6-18 redfield rifle scope be alright on it.
I personally would think that a 6-18 would be way over-scoped for a ML gun. 3x9's are probably the most common. But if it works for you that is what really counts.
I know the omega is the best out of these
I would agree and if you can get the bucks - that is the one I would buy.. Cayugad has recommended the sidekick often as a quality gun...
I myself have a CVA Firebolt 50 cal... It will certainly do the job hunting in 90% of the hunting situations. I probably would not take it the target shooting competition if I could take my Remingtons or my A&H, but for hunting it would do just fine.
Take a look at some of the Knight guns also they have a very good reputation.