I'm using Lee's truncated cone mold and the slugs are dropping at 180gr. I lubed with them with a 50/50 alox and mineral spirits mix with a coal of 1.258. The cartridges fall freely into the chamber.
Problems I'm having:
I will have 5-10 trouble free rds. Then the cartridges begin to not fully chamber and have to pushed in. If I use a brush to clean the chamber then the cartridges will feed smoothly again.
I am also having failures to feed. The boolit will get caught at an angle with the nose jammed at the top of the chamber and the bottom of the case in the magazine.
What am I doing wrong? Am I loading too long? Is the truncated cone a problem? The lube? I don't have the same problems with fmj's of the same design.
thank you for any advice given.