I am trying to build the decker .I want to ECM the barrel but it is impossible to find the files to ECM a .380 barrel. has anyone done it? I can only find immortal revolts V3.5 ECM Mega Pack and doesn’t include the .380. I found his ECM guide in the ECM files for the stingray it was V3.62 and it did include the dimensions for the .380, but it only has the STL files for 9mm. where can I get the STL for the mandrel and the other stuff I have been searching for 2 weeks I am going insane!!!

this is what I have found from the guide

.380ACP

8.84mm bore, 9.02mm groves, 9.06mm throat. The .380ACP mandrels has 1:16 twist rate and 6 grooves.

Chamber depth is 14.35mm, Throat depth is 17.85mm and throat is 3.5mm long.

The cartridge headspaces on the case mouth.

METRIC tools use 6mm steel rods and IMPERIAL tools use 1/4 inch rods.

  • liberterasaEnglish
    5·
    1 month ago

    Ok, I posted like an id10t with info you already had. Here’s take 2:

    I have been referencing the Rebel9/Rogue9 packages, which have ECM v3.64. But you’re right, the mandrel for .380, which should have a twist of 1:16, isn’t provided. You could still use the 9mm mandrel with its twist rate 1:10. I’m not sure how much of an effect that increased twist will have on accuracy. It might destabilize the bullet more quickly over distance. That’s something I’ll have to research, but your gun would still shoot fine with the 9mm rifling.

    I’m pulling together the tools for my own project, so I haven’t completed a build yet. The main difference for chambering the .380 is in adjusting the dimensions of the chambering and throat tool. In the METRIC and IMPERIAL Tools Multi Caliber folder, you should find the STLs you need, including the tool spacing jig: “Tool Spacing Jig 9x18_9x19_380 METRIC”. It appears that tool spacing jig is cross-compatible, so I am guessing that you would need to adjust how much of the chambering rod is inserted into the chamber end of the barrel, as well as where the rifling mandrel begins.

    It’s an interesting puzzle. I’ll have to take a closer look later this evening and see if I can figure out how this would work.