In need of 9MM Luger Recipe (124Gr. Hornady @ .355" dia.)

Hmm, I still think 4.2-4.4gr should be your starting point.
Only if you had a chrono..., you'd be able to get where you gotta be in very little time.

What I do is - load 5rds each with same OAL but diff powder charge (in 0.1gr step) and start with somewhat light and see where I'm at velosity and pressure wise, firing 4rounds; test next up or down depending on the results and settle on reliable light load withing power factor I need to make.

You should crimp in a way the case wall is straight and there is no deformation to the bullet.
 
the crimp will reduce the flare or "bell" at the top end of your round and make it cycle smoothly. Second to that, it will decrease the chance of a bullet being stuffed back into the case ( which we discussed before; and this causes dangerous pressure spikes).

* your revised load looks like an excellent choice*
 
Well I did further checking that I didn't have time for when I posted the earlier results. (which I always do to compare/validate results, I don't use the software blindly) It seems that the software for HP-38 is not that accurate. It is very accurate for MOST loads but occasionally it is off.

In this case it looks like it might be calculating calculating pressures that are too high.

From the Hodgdons website, a 125gr Sierra FMJ RN bullet seated at 1.09" OAL generates 28,800 psi when using 4.8gr of HP-38. Since the Sierra FMJ bullet is a touch longer than the Hornday you plan to use, then this data should be valid.

However, all the comments about shortening OAL remain valid and WILL increase the pressures and can do so significantly.

The value of 4.2 to 4.3gr HP-38 should be OK at your shorter OAL. (BTW, HP-38 powder is Winchester 231 under a different name so you can look up data for W231)

Note: Even the Hodgdon data might seem odd. Look at the 125gr LCN (lead conical nose) data. 4.4gr of HP-38 (W231) with an OAL of 1.125" generates 31,200 psi. This is why it is important to go with published loads. Now when I plug THESE numbers into QuickLoad, with a Rainier lead bullet, the results are perfect match.
 
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