I miss those flying ashtrays, those were neat bullets. You're right about needing to slow them down. My 190gr bullet is the same way, I made it with the old flying ashtray in mind.

The Mihec bullet takes a little more speed to open up, but has a narrower velocity window that it works in, if you cast with wheelweight alloy anyway.

I think I've posted it before - my cast bullet equivalent of the flying ashtray. It still opens to some degree all the way down to 600-650 fps:
[Linked Image]