Assuming that detonation in a real danger, where should I start worring about it in my light loads? I use Unique in my .357 loads behind a 158gr LRN. I've found that I like 5.0 grains. That seems to fill the case about halfway when it's on it's side and covers about half of the flash hole.
Where might I start treading on thin ice? I think 5.0 is the lightest I'm going to go but just out of curiosity, where do y'all think the danger line is?