I haven't tried the FTX or any of the mono bullets... the issue I have with .30-30 bullet is that most of them are designed to run at 2000 fps +/-, in the case of the 170 gr, and pushing it a few hundred fps faster may make things come apart or limit penetration from overexpansion. Even the factory .307 ammo seems to be a little on the soft side, considering that the .307 is supposed to be a step up from the .30-30 and might be used on much larger game. It might actually provide and excuse for the existance of the .30-30 Nosler Partition though. If I ever find any I'll have to give them a try.