I have done a fair amount of chronographing 357 loads out of a 4"
barrel and 296/H110 is too slow for best velocity. 2400 will yield more
velocity with less drama. I would suggest that you consider a hard
cast 158 gr SWC instead of the JHP. Good velocity from a 4" barrel is
hard to achieve with a 158 gr jacketed bullet. A reasonable charge of
2400 and a magnum primer will yield well over 1300 fps out of a 4"
barrel with a cast bullet. Well above the actual velocity you will see
with a 158 gr jacketed bullet.
barrel and 296/H110 is too slow for best velocity. 2400 will yield more
velocity with less drama. I would suggest that you consider a hard
cast 158 gr SWC instead of the JHP. Good velocity from a 4" barrel is
hard to achieve with a 158 gr jacketed bullet. A reasonable charge of
2400 and a magnum primer will yield well over 1300 fps out of a 4"
barrel with a cast bullet. Well above the actual velocity you will see
with a 158 gr jacketed bullet.