I am not up on this area of specialized work. A guy I know may be doing a bolt gun in 450 bushmaster with the express intent of pushing long for.caliber bullets in a subsonic application. My work is all jacketed stuff so I'm going to throw this out here for help from our resident casting/coating experts. Below are his questions to me that I'm not qualified to answer.
1) Most places that advertise custom mold making limit to 1.4" or so on the bullet length. I haven't reached out to MP molds specifically yet, but I didn't even see custom design fab on their website. I'm wondering if the length alone puts my project in an unusual category requiring a specialist
2) I'm having trouble finding clear ideas on optimizations for purely-subsonic designs. I see lots of ideas on blogs but they often contradict each other
3) I *think* I want to go the route of powder coating, and using a bore-rider front with a driving band starting in the middle so that I can remain compatible with a stock reamed chamber in 450 bushmaster or 458 socom. I gather that most people using powder coating are using it in non-precision supersonic applications with comparatively blunt nose profiles. I'm wondering if powder coating is the right path, if extra nose finishing is required for my use case, and if I need to size the bore riding section.
1) Most places that advertise custom mold making limit to 1.4" or so on the bullet length. I haven't reached out to MP molds specifically yet, but I didn't even see custom design fab on their website. I'm wondering if the length alone puts my project in an unusual category requiring a specialist
2) I'm having trouble finding clear ideas on optimizations for purely-subsonic designs. I see lots of ideas on blogs but they often contradict each other
3) I *think* I want to go the route of powder coating, and using a bore-rider front with a driving band starting in the middle so that I can remain compatible with a stock reamed chamber in 450 bushmaster or 458 socom. I gather that most people using powder coating are using it in non-precision supersonic applications with comparatively blunt nose profiles. I'm wondering if powder coating is the right path, if extra nose finishing is required for my use case, and if I need to size the bore riding section.