For me, the .243 would be the minimum! The .22 CF's are legal here, but I just don't think that using something that you have to be "perfect" with, is worth it! No, I do not think that bigger, makes up for accuracy, but bigger does give you "reasonable room for error!" If it's legal, use 'em if you wish, just use good hunting bullets! I would NEVER recomend the .22's to newbies! I know I'll hear many, "it was my first gun," stories, but again theres too much perfection involved with them to suggest rookies use them!