Well the case hasn't changed, the bullets haven't changed much, the primers are about the same so I have to wonder if (1) the newer runs of powder are different somehow or perhaps they are worried about some liability issues with smaller and smaller frames and lighter guns chambered for this cartridge. Either way I shot a lot of Blue Dot for years in the 357 and 41 mag and had no issues with pressure and got respectable results. Good volume per case capacity ratio in the 357 and 41.

I am also smart enough to know that runs of powder from batch to batch can have some differences that if your are pushing the envelope can all of a sudden put you into the red zone. I had this happen many years ago with some IMR 4756 and at first thought it was me then finally read about some issues later in Handloader. Since then I always mix the last 1/4-1/3 of a can in with the new can to blend and average things out. . Very interesting information as it seems that nothing stays the same anymore.