In my 4” Model 19, when I load 2400 with a Lyman 358156 (solid or HP) in 357 cases I get about 1000 fps with 10 grs, 1100 fps with 11 grs and 1200 fps with 12 grs.
If you want to use 38 Special cases, load that bullet so it crimps into the lower crimping groove for an o/all length that is pretty close to the o/all length when it’s loaded in 357 cases. I used to use magnum primers but switched to standard primers a while back and got practically the same results. Superb accuracy regardless of the primer.
With the same bullets in 38 Special cases with 4.0 grs of Bullseye, a CCI 500 at 1.57” o/all I get just over 800 fps in my 3” model 60. They’re as accurate as I can hold.
In a 5” model 60 with 357 cases, the same bullets and primer, 5.0 grs of Unique gave 870 fps.
