Simmer down wrote:
I'm no pro at reloading but putting 38 spec loads in a 357 case and using 357 overall length will make a different load than what the 38 data shows. The air space is increased and the load is altered.
Hmmm, should have 'splained it better.
The loads I'm talking about are for a 357. The velocity for lead bullets is about the same as a 38 sp shooting a jacketed bullet.
Here's an example from Hodgdon's site. I didn't make these up, they are recommended load data (pistol velocities).
Bullet- Powder - dia - COAL - gr - vel - press - gr - vel - press
357Mag load for cast lead
158 GR. CAST LSWC - IMR Trail Boss - .357" - 1.610" - 3.2 - 754 - 16,500 CUP - 4.2 - 865 - 20,400 CUP
Here's a light load for a 357 jacketed
158 GR. HDY XTP - IMR SR 4756 - .357" - 1.580" - 5.0 - 896 - 17,500 PSI - 6.5 - 1146 - 29,900 PSI
Hear's a 38 sp jacketed
158 GR. HDY XTP - Win AutoComp - .357" - 1.455" - 4.5 - 751 - 14,000 PSI - 4.9 - 865 - 16,800 PSI
Here's a 38 sp +P jacketed
158 GR. HDY XTP - Hodgdon - HS-6 - .357" - 1.455" - - - - - - - - - - - - - - - - - 6.6 - 926 - 18,700 CUP
Of course you can get a lot higher velocities out of the 357 with other loads, but you'll notice the starting and max velocity on the lead bullet is almost identical to the 38sp jacketed load. The light load for the 357 is only marginally faster than the 38 sp.
Since you would have 357 casings you could always use a load from one of the powder manufacturers that will push a jacketed bullet between 1500 and 1600 fps if you want a barn burner.
My Berrys bullets are 125 gr flat points.
I can push them out with a min 357 load at 986 fps with my powder compared to a 38 sp starting at 924fps with the same powder and same bullet. The max load velocities differ by 300fps however.
Berry's also makes hollow point and round nose copper plated bullets.
Hope this helps explain what I was getting at.