I did some testing with factory .38 HSM and Winchester cowboy action loads. (158 gr. bullet)
I did the test with the rifle flat and tipping it up to about 170 degrees between shots.
Rifle used was a Uberti 357 with a 20-inch barrel.
Testing was done in an indoor range use a Lab Radar chrono. Temp was about 65.
We are about 400 ft. above sea level.
HSM flat gave a power factor of 157.1 Tipping up gave a power factor of 158.8.
Winchester flat gave a power factor of 167.6. Tipping up gave a power factor of 169.8.
So, as you can see 150 PF is easily attainable. Just need the minimum bullet weight for
38/357 to be 158.
WB ROC and TG's need to consider this.
Marshal Stone