Since you are spending money at Cabelas here is what I use on all my guns and arrowheads.

http://cabelas.com/cabelas/en/templates/links/link.jsp?id=0027404416721a&type=product&cm Cat=search&returnPage=search-results1.jsp&QueryText=digital+scale&N=488 7&Ntk=Products&Ntx=mode+matchall&Nty=1 &Ntt=digital+scale&noImage=0

The shot cup that comes with the TK will hold 2 oz of #4 which is the cup full of shot. At least that is what mine comes to anyway.