I would still try it first at the reccomended 1.175 oal first. see if your firearm feeds it well, then go about changing the length if nessecary. My Springfield 1911 handles rainier 230 frm just fine at that oal.Lyman no 48 Reloading handbook reccomends an OAL of 1.175". I would extend that to 1.230. Experienced hooking of the case mouth on the ramp at the shorter length. (Kimber Custom 2 .45)
There's a lot of other data but this should get you where you want to go.I use TiteGroup with 230 gr XTP/JHP but have neve found a load for this powder and a 185 gr bullet. As previously mentioned W231 is an excellent choice.
D. Manley, does the Hornady manual list a min OAL for that data?
It was 200 Gr, but it thought that they are both loaded to the same O.A.L. They both look nearly the same, just one is shorter. I could be wrong here as I have not actually measured a 185 Gr factory load. Maybe someone has some and can tell us.