Gday friends .. I am a new caster and was wondering how much lead free solder wire to add to my lead to harden it up ... when i cast my first batch of 405gr. bullets they came out Great but seemed to soft ...... so i put in 150 grains of lead free solder per pound of lead on the next melt and the bullets came out a mess ... they were deformed , swirles,voides ,etc ......... any advice would be appreciated ................ kind regards ..... Davey