In another thread, I had mentioned that I had problems with spent primers not going into the collection tube about half the time.
I recently purchased a Lee Classic Cast single stage to replace the Challenger Breech Lock single stage. A couple of differences I noticed other than the obvious classic cast is a much beefier press. In the Classic Cast, the primer arms can only be installed and removed when the shell holder is removed and the primer arms will not fall out of it during use. In the Challenger, I could install and remove the primer arms while the shell holder was installed and the primer arms would occasionally fall out during use. In the classic cast, I have had absolutely no spent primers make it on the floor. They all went in the collection tube. In the challenger, about half would end up on the floor. They would either somehow bounce off the primer arm and come out that slot, or they will overshoot the collection box the collection tube is hung from.
Since others have said they have not had this problem, I am thinking mine was defective?
There was also one poster who has the breech lock classic cast that says he doesn't have the problem.
In either case, I like the Classic Cast much better and I like that the spent primers drop out the bottom of the ram into the collection tube. I purchased the Hornady Lock-N-Load bushing conversion kit to use with the classic cast. I find the Hornady bushings are easier to install and remove than the Lee breech lock bushings.
Just my observations so far.