I suspect two likely reasons for the hard bolt closure:I know just what you mean on forming VT brass. After forming so many 223 brass to VT brass, I chambered check every piece of VT brass. Many of them would not chamber properly, bolt wouldn't close, hard bolt closure, etc. Those would be discarded. I only kept the VT brass that would function property.
When all my VT brass is gone, I may try a .20 Fireball. Just neck the .221 down to .20. Similar to the .20 Practical forming.
1. Unturned necks as L.Sherm has indicated above.
2. Insufficient annealing of the VT shoulder causing excessive spring back in the forming stage. Brass at the shoulder of the newly formed VT shoulder is very thick and requires proper annealing to stay in place.
Rick M.









