Therein lies your best bet for assured accuracy. The 100's are a crapshoot, and even the vaunted 100 grain CoreLoct is on the ragged edge of "maybe it'll work maybe it won't" in any given gun. The simple universal physical laws that govern this stuff can't be repudiated. Rate of twist, velocity, air temp, atmospheric pressure, humidity, elevation above sea level, etc. all have a say in the matter. You can dick around trying to make 100's work, and you may succeed, but if you have more important things to do with your life then just head straight to the 87 Speers. You won't gain a heckuva lot by using 100's over the 87's anyway.
