I like GUNS so caliber is often not all that important to me. I shy away from some because I love shooting too and if I can't get brass or bullets I will not be as interested. An example is the old Remington M8 rifles which were made in 25 Rem 30 rem 32 rem and 35 rem. I ONLY would buy the 35 Remington. I can make 25 Rem, 30 Rem and 32 Rem brass from 30-30, but I don't really want to.
So I don't get overly concerned about calibers. I like the guns, and what every caliber they are is usually OK. Not always, but most times.
Find a new gun that you like and don't worry about the caliber unless it's one you can't or won't use
