Any of you guys reload 40MM chalk?

[mattnh]

The receiver was a 3D printed one. The burst disk… didn’t. Instead the blank was forced out the back of the shell. I can provide gory details, but the short version is things shattered. No injury, and I printed another receiver, and was back up and running a few hours later.

OK, so, it was a plastic receiver...

 

[Starvingboy]

Yep. It was the original NT-79 design, for those interested. After that I switched to the reinforced version, using PLA+. I also have a couple on standby made of carbon-fiber nylon.

Either way, sitting there going “WTF!?!” while pieces landed around me was quite the experience.

 

[Kkontx]

What lift charge are you all using for the chalk rounds. Got the reloadable aluminum m212 cases from Pace Defense with the xd end cap. Is 5 grains of Bullseye a typical charge with for a standard zinc pusher with ogive full of chalk? If not, what do you guys usually use if you load your own blanks/cases?

Also a plastic receiver sounds like a single use receiver lol. The recoil from just the beehive/hornets nest rounds were enough to break and strip out threads on a metal gopro mount I had on my receiver. Don't know if I'd trust a plastic receiver to handle any amount of recoil.

 

[Starvingboy]

The plastic receiver is 37mm. It is a good inexpensive way to play without risking the 40mm. I’ve put somewhere around 300 rounds through the thing so far, goofing around and working up loads. I’m using 8 grains of trail boss in a high/low shell right now.

There is quite a resurgence of 37mm launchers in the 3D printing community. Most use black powder for their lift charge. I tried it, it works well, but for whatever reason I prefer smokeless high/low.

Now if I can just get my fuses to light…

 

[sniperdoc]

Is anyone here 3d printing olives?

 

[Starvingboy]

Yep. Lots of them. I have a screw-together design that I have printed a pile of… in 37mm. The same design should work fine for 40mm, slightly scaled up.

 

[Kkontx]

What lift charge are you all using for the chalk rounds. Got the reloadable aluminum m212 cases from Pace Defense with the xd end cap. Is 5 grains of Bullseye a typical charge with for a standard zinc pusher with ogive full of chalk? If not, what do you guys usually use if you load your own blanks/cases?

Anyone happen to have some info for the lift charge loading?