150 Heritage or lower for a 125 grain head (and that is likely to need a 100 grain brass insert to help).
Do not mess with the 250's if you want a 125 grain head to work. 125 point shouldn't work for you even at full length on the 250's with 100 grain inserts.
You may even want the Heritage 90's if you just want the 125 grain point with standard inserts. I just tuned my bow for these Heritage 150 shafts and I needed a 100 grain brass insert plus the 125 grain point to bare shaft tune my arrows well.
Your results will be slightly different, but I hope this helps. Use hotmelt glue instead of epoxy until you are sure about inserts and point weight.
Good luck,
-Charlie