IMHO, FIRSTLY, DON'T WORRY ABOUT SPECS. SHOOT THE BOWS, BUY WHICH EVER ONE FEELS BETTER TO YOU. ALL BRANDS THESE DAYS MAKE QUALITY STUFF. IF YOUR NEW TO THE SPORT, ASK SOME ONE WHO KNOWS WHAT THERE DOING TO GO WITH YOU AND HELP YOU THROUGH THE PROCESS. I BOUGHT A PARKER UL 31 FOR MY FIRST BOW OVER 8 YRS AGO. STILL SHOOTS AS GOOD AS THE DAY I BOUGHT IT. THE SHOOTER MAKES THE BOW, NOT THE OTHER WAY AROUND. BY THE WAY THE CAMS ON THE CHALLENGER LOOKS KINDA LIKE THE UL 31 CAM BUT SMALLER IN SIZE. I KNOW THE CAM ON THE UL 31 WASREALLY GOOD FOR A BOW 10YRS OLD IN DESIGN. STILL AS FAST AS THE NEW STUFF THAT IS COMING OUT IN 08. I FIGURE @26DL 50 POUNDS SOME WHERE IN THE 240-260 RANGE MAYBE, BUT LIKE I SAID BEFORE, IT'S REALLY NOT THAT IMPORTANT IN THE BIG PICTURE, SUCH AS COMFORT. GOOD LUCK ON YOUR PURCHASE.