It's a Micro groove barrel with a 1 in 20 twist, so Ill have to keep my velocity down to 1600 fps or less to keep from slipping due to the shallow rifling. I think thats where the problem is ,unlike the ballard style rifle barrel that cuts better on a cast bullet. I casted some 405 rfp gr last night and water quenched them and they came out pretty hard for the speed I'm looking for. 16-17 for hardness. It's a no gc bullet. I'll give that a try and post my results. I'll save the jacketed stuff if I ever decide to hunt anything. If you guys dont mind post a few more loads as I want to experiment with this rifle. Keep in mind the 1600 fps or less loads as it's a micro groove barrel. Thaks for all your input.....Super.