Required twist is determined by bullet LENGTH, not weight. Since heavier bullets are generally longer, of course, they need a faster twist than a shorter (lighter??) one. Use the Greenhill formula to calculate the required twist for a given bullet:

Twist needed (in calibers) = 150/length of bullet (in calibers.)

However, often a short, stubby round-nose bullet can weigh as much or more than a long, pointy boattailed one. In such cases, one might be able to get acceptable performanbce from the short, heavy bullet even if the twist is to slow for a long pointed one of the same or even less weight.

I remember that the 1/12" twist originally used with the .244 Remington would not stabilizea105-grain Speer spitzer, but worked fine with the 105-grain Speer round-nose!