I bought a Tikka T3X Super Varmint with a 22" barrel with 1:8" twist rate. My first reloads were with 55gr Sierra SBT #1365 and two experimental powders, Viht N530 and Varget. The result was so-so, not what I hope for. Given the 1:8" twist rate, I want to try a heavier bullet, maybe 65 gr. What experience have you guys had with powders, bullets, etc.? I'll appreciate any help you can offer. Tom