Neverhome,
Some preliminary questions for you:
1. What is the sprue hole diameter in your mould?
2. Describe how you cast; i.e. normal temperatures or slightly superheated(degrees above melting), air-cooled or water quenched, etc.
3. What type of casting flux; i.e. Marvellux, sawdust, etc?
4. If this is a NOE mould, what is the location of the CP(Center of Pressure) and the location of the CG(Center of Gravity) ? NOE typically provides this info on their bullet drawings.
After getting these questions answered, if you like, we can discuss bullet stability as researched/patented by the US Air Force and Arrow Tech,VT.
Best regards,
CJR