anyone reload Mihec 359-640 ( 357 mag) with BR-5 powder from Bartlett reloaders ?

[HikerLT]

I cast some 357 mag hp bullets today using the Mihec 359-640 mold.

Looking for reload recipe using this bullet and BR-5 powder from Bartlett reloaders ( gi brass) ?

the description of this powder says to use Unique load data.

[blackpowder man]

I’m not sure the details on the 359-640, but I’ve been working on a load for the Mihec 150kt clone of the rcbs mold. These are probably pushing +p in .38 special. Using mixed headstamp brass and Federal small pistol primers. I got my BR-5 a month or so ago. I tried 5.0, 5.2, 5.6. All were pretty good, but I think 5.6 was the best. These were shot in a 357 magnum model 19. I would not shoot them in a .38 without at least running them over a chronograph. I tried 6.0 and 6.7 in .357 brass and the 6.7 load was better I think.
Maybe this will help. Keep us posted if you come up with something that works good for you.