I am getting ready to have a custom rifle built for predators and am looking for a caliber. The first gunsmith I went to said that in his opinion the 6x47 or 6x45 are the best all around predator calibers period. He says they offer very low recoil, easy and cheap to load for, shoot relatively large bullets at decent speeds (3100-3500), is fur friendly, can be used for small to medium deer/pigs at ranges up to 200 yards and less, has a very long barrel life, and is extremely accurate. I hunt in California and the majority of my shooting is under 200 yards with the occasional 300-350 shot being presented. I don't shoot that far except very rarely since frankly I'm not that good. Any thoughts on this caliber for coyotes and bobcats? I know the trend has been to fast "flatter" rounds and in fact I have two .204's one fat one for varmints and one light carry Savage. So that should probably come into play in my decision as well. Wildcats are not a problem since I do enjoy reloading and for coyote and bobcats I'm not burning through too many rounds in a season anyway.