I had two MP moulds previous to this and both required major work to fix. The 452-200-SWC had bumps, yes BUMPS on the meplat (a physical machining impossibility, but they were there), three on each cavity, which locked the bullets in there solidly against the front driving band. Many hours with an Exacto knife, pencil eraser, and valve grinding compound to get rid of them. After that it was a good mould. I still don't like the 90° front band which has no draft and tends to make the bullets stick a little, but it does ok with an adjustment to the shucking technique. The other was the bad SIL mould, for which I was supposed to get new blocks only but Miha sent me a whole new complete mould. Starmetal got his replaced, too. I never cast with the replacement, I sold it unused to Goodsteel and let it be his problem because the gas check shanks were grossly oversized.
I have borrowed about 5-6 MP moulds from my neighbor and all have been excellent, HP and solid, no problems whatsoever. I swear I'm snakebit when it comes to buying my own NOE and MP, not counting these last two from MP I have not gotten a single mould from either company which didn't have major to fatal problems. On the other hand, I have only ever had one "bad" Lee mould, and by bad I mean a .452" mould that threw a .456" bullet which was of a design that didn't favor that much sizing down. 1 out of 40+ ain't bad from the cheapest mould maker in the universe.