Hello, and Welcome to the sight. To start off, check the "load data" threads. A lot of the guys offer up their pet loads. You can use them as a guide, as you work up loads in your gun. Heavy? As in bullet, or powder? If you're lucky, some of the guys that really know some thing will chime in, on the use of certain weight bullets in your 1/10 twist Tikka, or read the "loads thread" carefully. Most guys post the twist they're using, to get their results. I, d suggest you do what I did, when I found this site. I spent a lot of hours, going way back into the threads, combing for info, and advice that was already posted. You'll come to recognize Who really knows their stuff. AND, if you ever get flamed: try not to take it too seriously. Every body has a bad day, once in a while, and some guy's are just natural born. I'm just getting back into .223, because I'm in a cheap phase, and like stretching a pound of powder, and I'm tired off searching empty racks, for it.