Danny,
Those Remington loads are too hot for your Contender. I'd stop using them right away before you have an accident. The .444 in the Contender is a touchy subject, it can be done but you need lower pressure loads than those used for the rest of the guns out there. The Contender frame is just not meant to take it. And no, having a G2 does not change anything.
I have one in .444 in a 10" tube and you can shoot it all day with proper loads. But if you are using factory loads you will have the frame ruined sooner or later and a high speed piece of brass headed toward your face.