I have been using gut mains with MSV co-focus crosses and really like it. I am wondering about using up some shaped poly that I had been using in a full bed (BHSR, BHB7, Focus Hex). Does anyone used a shaped poly cross with gut? I am assuming it will cut through the gut quicker than a smooth poly. I don't mind a bit shorter life but don't want to go from a 20-hr. lifespan to 10-hrs. or something like that.