I develope and test loads, after I shoot a certain test load I inspect thecases and primers for excessive pressure, then I dump'em back into the spent case bucket.
If I run into cases that show any sign of too much pressure I set those aside as to inspect them after I resize those dudes. I don't mark anything, when the load comes around to what I think it should be then I get new or oncefired brass and load at least fifty, and put them up for season or for fun.
Also I don't load for anybody outside my house, although if I'm at the range and have extra I will share with my #1 son,(cause he never brings enough) but thats it.