It's a good one. I have a couple of them, made for rockchucks and pd's with lighter bullets going fast. The heavy barrel is 13" twist and was real easy to make it shoot, didn't need to fool with it much at all. Preferred load is WW760 and 70TNT from high 3700's to 3858. Shoots in the .2's and .3's, a very nice gun but also very heavy. The other one is much lighter with a 9" twist, and it's much fussier about loads. For varmint shooting I'd stay with the slower twist..
