Well, as a long time TC user (1969-70) I also like their being light to carry and short enough to swing even in thick brush. I have several, but my favorite Contender calling rig is a wispy 18" Brown chambered in 6X47 that wears a Choate folding stock. But since I hunt alone and quite often call in multiples when out calling, the single shot does become an annoyance - so I carry a backup pistola as well. Been calling predators for over 30 years, but in my minds eye now days, a short and light weight "repeater" is the only way to go for a calling rig. The 223 is an excellent choice, but I'd opt out for one of the small bolt guns if I was buying one for the first time now days. I bought a Rem 78 Sportsman in 223, and it is laser accurate, but is just too heavy and long for the miles I walk and the scrub I usually set up in. The Remington Model 7 line is a good place to start looking (or any others that are compareable to it). Way more accurate than you'll need for the distances you'll be shooting at too. Just some thoughts to ponder.
Ladobe