I have a Tikka T3 tactical in .223 and am having issues with accuracy. They have a sub MOA guarantee @100yds. That's all fine and dandy until I reach out pass that. At 200yds I have 5in groups. At 100 easy under MOA. Ammo issue maybe? Only thing I can come up with. It's a 1 in 8" twist rate. I've been using AE223 ammo in 55gr. I've haven't reloaded any as of yet. I am going to try the 75gr Hornady A-Max. Velocity with that twist rate? Just doesn't make sense to me. Any suggestions or ideas would be great. Thanks.