"What is the best rimfire bolt actioned rifle now avaiable ?"

I would say alot of this will be a matter of personal taste and opinion. That said I am very partial to a Steyr Zephyr, that would be my ultimate .22. I really like a Kimber of America ones as well. There are some wonderful Kimber of Oregon one's with all the bells and whistles on them that are for sure a Best Gun.