Esox, is there a reason you aren't saying what kind of rifle it is and if it is properly glass bedded. Generally I like to start at the start and not at the load. All you say is it is a "custom", and the kind of barrel it has. What is it and is it properly glass bedded? You can monkey fu ck around and goat rope all day long with a rifle that is not properly glass bedded and not get good accuracy, yet I see this all the time. Guys want to blame it on something like the load or cartridge or shooter, when it is a dog of a rifle...