Excellent! Mine arrived yesterday, but I'm bogged down writing a paper, so won't get to play with them for a couple of weeks. Therefore I shall vicariously share your joy.

I have the 49th Edition Lyman Reloading Handbook, which I assume (it's the only Lyman book I own) is the regular one as it has loads for both jacketed and cast bullets.

It has a number of loads for #358430 in a .38 S&W case (and a couple of lighter bullets). One thing - the book calls it a 195 grain bullet, but since the range from start to max is 0.2 grains for most powders (except for True Blue, which they rate the most accurate for this round and has a 0.4 grain spread) I figure that any theoretical adjustment in powder load for the 5gn difference in bullet weight would be less than the sensitivity of my scales. So I shan't worry about it.

It also says two apparently contradictory things:
1. These loads are not recommended for top break revolvers, due to their age and weakness.
2. Bullet #358430 is similar to the Britishicon for 380/200 load.

I'm interpreting all that to mean "Don't use these loads in weak American top break revolvers, but you'll be fine with a sturdy British war horse."