Finally got out this morning and chronographed 10 rds 38 Spl +P using 5.6 grs Power Pistol, Speer 158 gr LSWC and CCI-500 primers from my S&W 642 1 7/8 inch. The 5.6 grs load averaged this time 825 FPS.
The 5.6 grs Power Pistol 38 Spl +P 158 gr LSWC loading is a favorite of mine. I used up to 6.0 grs in the past but this load was getting a bit uncomfortable in the Airweight. 5.6 grs is a good compromise and within Speer load data.
Recoil in my S&W 642 was comparable to Remington’s FBI load. Didn’t notice muzzle flash since shooting outside.