I read up on it a bit and found that due to the added length of the case and resulting volume I could add 10% to the load data so that's what I did and more. I used IMR 700-X at 4.8 grains which is higher than the Do Not Exceed number but accounting for the added volume and my estimate of resulting velocity it worked out well. I would not do this in a 38 case using a 38 special gun! Again, my goal was to stay just below the max velocity for Berry's 125 grain FP regular plate bullets which is 1250fps and I think I did that. They were accurate and the holes were round so I don't think I had any stripping or tumbling. Seeing as how the gun is a 357 magnum, the cases are 357 magnum cases and they were nowhere near 357 magnum pressure I saw no danger in this. I really need a chrono but can't just yet.akuser47 wrote: I have been shooting my .38 loads in .357 brass for a long time I hate carbon ring build up in the cylinders or chamber. So if you roll your own this is an option. Just be careful and remember use close to or max .38 special load data powder puff or light .38 special loads may squib.
I just don't know what to call them!
For now I just call them long 38's when I talk to someone about them, but some guy argued that they are just weak 357's. I don't agree. A 357 case was developed so that people wouldn't put a 357 magnum cartridge into a 38 special gun and blow themselves up. What makes it a 357 is the load not the case length so it's not a 357. That's the way I see it anyway. It's just a long hot 38...