My prime powder for building .38 Special +P ammo is HS-6 especially for the FBI Load. I have found using a magnum primer will air in a full burn of the powder but more over, they shrink the SD numbers to single digits.
*Warning* The charge below exceeds most current data available but was published in the past. If you choose to use it blame no one but yourself if something goes bad.
Here is one of my loads, the FBI Load:
Winchester .38 Special +P case
158gr Hornady LSWC/HP
CCI 550 Primer (Magnum primer on this load)
7.0gr HS-6
COL 1.475"
4" M686 ---- 2" M640
927.0 -- AV --- 888.9
955.1 --- H --- 897.1
905.4 --- L --- 876.6
49.7 ---- ES --- 20.5
20.7 ---- SD ---- 7.9
17.0 ---- AD ---- 5.9
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SWCA #3437
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