Please tell me more about your 350L cast load’s. I’m casting with WW and powder coating. Trying to figure out if I need to go with a harder alloy or slower powder, or both. A 200gr Lee 358-200 cast with 4227 I get to around 1400 with decent accuracy and then it falls apart trying to go faster.
Switch to 1680 powder, and check your bullet fit against your throat diameter. If you're powder coating you should be able to go softer not harder which may well improve accuracy, improve expansion, and still not lead - if the bullet fits your throat. (Although I get great accuracy and velocity as well with 4227, 1680 has the edge, at least in my .357 Maximum rifle ballistic twin to the Legend.)
