Good advise. Additionally, before I raised the powder charge, I would first:DocV wrote:I have had some over pressure signs with 231 under 9mm lead, even with starting loads. Mainly light guppying.
What type of pistol are you loading for? Is the case fully supported? 4.5 gr of 231 for your projectile is around
38000 to 39000 psi. That is +p territory.
SAAMI max for 9mm is 35000 psi. How about making loads for 4.1, 4.2 and 4.3. Ten rounds each. Fire those.
Check for pressure signs and function.
1) Crony the loads to see if they are reaching stated velocities.
2) Make sure the problem isn't from the gun.
3) Check to see that the crimp is tight enough.