I no longer have a picture - but the difference is that the blade over shaft is slightly less (which adds some strength). The remaining weight is in the collar. I prefer the 125's for this reason.

 

Ok, so essentially the "cone" of the ferrule is a little shorter and the collar is a little thinner on the 100 grain. Guess I'll stick with the 125s.

Only reason I was considering the 100s was so I could throw a 50 grain FACT weight into those arrows and have identical weight to my 150 grain Bloodeagles. But I can just use a 20 grain FACT and be close enough.

 

I’ve wondered this myself. Just switched to Exodus. I didn’t realize at first the blade size was different, blades are a little hard to find to. I ended up ordering from Lancaster Archery.

 

I've used the 100gr on 12 elk and 6 moose, if your worried about strength, don't. But if need some more weight the 125gr are as good as they come

 

25 grains give or take.

 

I’ve used the 100 grains. I think I would bump up to 125