Master Blaster
Member
Well the title says it all I went to the IMR website and looked at the trail boss data for .357 mag and .38 spl in the 158 LSWC bullet style. The load is listed for both cartridges and they both have about the same velocity 800-865 fps. OK its cowboy data and probably not really maximum. BUT
for the .38 spl 158 LSWC they list a max load of 4.2 gr, pressure 13,700 CUP, of Trail Boss.
For the .357 mag case they have 4.2 gr of TrailBoss and they list the pressure as 20,700 CUP
Problem the .357 mag has a larger case and it has a 7,000 CUP INCREASE over a smaller case with the same bullet and the same 4.2 gr load???????
Is the .38spl load SAFE Would it be safe if the real .38spl pressure is like 23,000 CUP?????????
Data is here http://www.imrpowder.com/data/handgun/trailboss-feb2005.php
for the .38 spl 158 LSWC they list a max load of 4.2 gr, pressure 13,700 CUP, of Trail Boss.
For the .357 mag case they have 4.2 gr of TrailBoss and they list the pressure as 20,700 CUP
Problem the .357 mag has a larger case and it has a 7,000 CUP INCREASE over a smaller case with the same bullet and the same 4.2 gr load???????
Is the .38spl load SAFE Would it be safe if the real .38spl pressure is like 23,000 CUP?????????
Data is here http://www.imrpowder.com/data/handgun/trailboss-feb2005.php