I changed molds from a 233 grain to a 100 grain that I had used previously. I used up 800 bullets that I had cast a couple of years ago and coated with Hi-Tek. Decided to cast more of the 100 grainers to coat with Hi-Tek but they all look like trash. They all have some unfilled cracks down toward the nose. The base areas all are smooth. Usually the first 20 or so new casts will have some wrinkling but then smooth out. I just used the same batch of lead ingots last week to cast about 1500 233 grain bullets. I had no problem with those.
Today I switched to a different mold and can't get the bullets to fill out properly. These are small 100 grainers. Down toward the point there are some small areas that have voids like a crack. the base area looks really smooth. The lead I'm using is a combination of range scrap, wheel weights, lead bars of 50/50 lead-tin, and lead slugs from RMR. I've adjusted drop rate and temperature but nothing seems to help. Any ideas? I haven't had any problems before in the 4 years I've been casting. I'm casting on a Master Caster which is great by the way. I have inspected the molds very closely but don't see anything noticeable. I switched back to the 233 grain mold and they too now look like junk with grooves in them. Fill out problem or bad lead?