hello all , thanks for your suggestions, heres what i have done to solve the problem thus far,i resmoked mold, tilted mold, enlarged sprue hole, used edge of file to create vent hole to about 1/8 by1/16,and heres one thing i know was causing problems, i didnt keep ladle hot!! lead was starting to set before pouring, also i noticed if i slowed down the pour near the almost full to sprue hole, the extra amount allowed for some of the reduction in size to be curtailed some what,but i still have the same problem ,some pours better but in no order of pouring(that is no matter what temp of mold is warm to hot hot, so i think it may be the lack of tin?? anybody think of anthing else to look for?