I'm about to buy some more powder for 38sp and 357. Currently I have 2400, Universal, Titegroup and Lovex D03.6 here in the UK.
I don't use much Universal and titegroup as, TBH, it's too time consuming to individually weigh out the really small charges for indoor gallery ranges where I have to keep the mv down below 1400 fps, I have to do this as the flakes don't meter well and don't seem consistent when using the dippers.
I find I use quite a bit of the Lovex powder as it's very dense and I can throw remarkably consistent charges with a modified Lee dipper to get low velocity then just double them to get full house 357 loads.
I use the 2400 to stoke up the 357 but the lovex powder virtually matches them and it's so much cheaper.
Lovex also do two more handgun powders D037.1 and D037.2, which I've not used yet, with the latter equalling or surpassing 2400 and at lower listed pressures as well.
Lovex is sold in the states as shooters world powder, don't know how it's priced over there but it may be worth a punt as I know I'm impressed with it.
FWIW I use small rifle primers in my 38 and 357 loads.