[MileHi]

To be safe, start out light, and carefully work your way up. If you start to notice hard case extraction or primers starting to flatten or push out, then you are too hot.

Indeed, but how do you get one source that has a starting load considerably above another sources +P load? I could buy a small difference, but that is an Atlantic ocean of difference.

[eastexsteve]

Indeed, but how do you get one source that has a starting load considerably above another sources +P load? I could buy a small difference, but that is an Atlantic ocean of difference.

I have seen a difference of more than a grain before in handgun load data. Fast burning powders like Unique generate very high pressure. It doesn't take much difference in other components to have a profound effect on the test load. That's why they usually list all the other loading components (and test barrel) they use while producing the load.