I have the older Contender frame, and as far as I know the big difference between the older fame and the G2 is the grip angle was changed and the grip to trigger distance was altered. My Contender, as all others I have seen, will work with Rimfire or Centerfire. However the Contender and G2 has a lower preassure limit on the frame and cannot be chambered for cartridges like 243, 308, 30-06, etc. You may want to look at the Encore since there are currently more barrels and options available and it can be chambered in dang near anything.
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