As some have mentioned, try it with the Nikko to start with and see what its good and bad points are. I cannot see the range / model of the scope. If it is by some chance a Diamond then these are not too bad in most cases. If it is a mount master or Game king then an upgrade is probably on the cards. Mount masters perform pretty well on rimfire, but would not be my choice for a centre fire.
But as I said, I would try it with its current scope and see how you get on. I know a lot of people who have been pleasantly surprised at the Nikkos.
Long term, there are a lot of good scopes out there. Some you will like others you wont. Best bet is after you have used the Nikko, figure out exactly what you like in a scope and what you want it for then see what fits your budget and requirements. 600m is a long way so 3-9 will almost definitely not make the grade. And I would want to be sure the rifle was capable of that sort of accuracy as well as the scope. All the best and have fun...
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