is there something wrong with my scope base?

6.5x55swm

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I just traded for a Tikka T3 and it has a one piece base, under the base it's stamped EGW T3 20M. When I put weaver rings on it and snug up the screw, just a bit, the ring can move back and forth an eight of a inch, when I try the rings on weaver base it barely moves. Would this base take speical rings?
 
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