Thanks for the replies.
PWC, I took the ones I didn't 'trust' - either too light or too heavy (and some of the too-heavy were in oddball brand cases, which I didn't have a big enough sample size to determine their average 'proper' weight) and pulled the bullets. Turns out none of them were empty, and none were double charged - but now I was extra sure.
MMA10mm - those are good procedures, and I like the idea of adding a light to the side of the machine. The biggest safety improvement I did during last batch I loaded was to pre-inspect all the brass. Interruptions had been most often caused by small primer cases, or a 9 or 40 case lodged inside. Once my cases were good to go, it was easy to establish a rhythm and everything ran smoothly. I agree with you on the complexity and manual-ness of a loading block, although I do use them when I make up 'Super Duper Match' loads where all the charges are hand weighed, like rifle cartridges.