I bought a MP 4 cavity mould from a member here and it arrived on Monday. What a beautiful piece of brass. It's a .359 Hammer. I heat cycled it 3 times and today I had a few hours before work so I heated my lead in my bottom pour Lee pot and placed the mould on the hot plate and let it warm up for 30 minutes.
The first 5-6 pours were throw backs but soon I was getting pretty good boolits. The hotter the mould got the better they looked. I was imagining a very steep learning curve with this mould because of some of the posts I've read but it casted way better than I expected. I'm looking forward to casting a big pile with this mould.
My melt temperature was between 675 and 700 but the mould was hot. 50-50 alloy. I may need to invest in more brass moulds.