What we have done is very similar to you Bill. We freeze it in a 6 cc syringe with say 3 cc's. Then we pull the plunger back to give adequate room for expansion. Once we need to re-dose, we thaw a syringe and then draw up 2 more doses from the 6 cc syringe. We have not had any plunger mishaps. There is of course waste, but still much cheaper than getting it elsewhere.