Really depends how far you plan on wanting to shoot game. For a low recoil, accutate round I'd go 6.5X47. Keep in mind this will limit you to 6-700 yds on deer size game. I have two 6.5X47. One heavy full custom built by RBROS; other is semi custom I had done locally. Heavy practice gun shoots 130 Bergers at just under 3000 fps. Light weight hunting gun shoots 130 AccuBonds at 2850 fps. For a wildcat that will step up the game I would go with a 6.5 Sherman. 270 parent case and mine will drive a 140 Berger at 3339 fps out of a 28" Hart. For volume shooting the X47 is great as it has virtually no recoil ( mine is braked). only using up to 42.2 gr H4350 so it is very efficient. The Sherman however will take up into the 60 plus grain range and is basically a 6.5-06AI on steroids.