Printed .35 cal Pellets

[rsterne]

Of course you knew I had to make a few extra and try them, right.... 



They weight 8.6 gr. (SD=0.0096), fit in my .357 cal Hayabusa, and launch at 1747 fps (58 FPE).... They are 30% Cubic infill (same as the Chess Pieces), if you bumped them up to 100%, they would be a bit over 10 gr.... The Cedar 2x4 was shot at point blank range, the pellet penetrated just over halfway, and the pellet leaves a single hole at 20 ft., so it isn't coming apart on launch.... 

Bob

[WhatUPSbox?]

58 FPE in about an inch and a half. That's almost 500 lbs average force. Not bad for a 3D print. If you have some of your ballistic soap/gel that would be a interesting image.

[Mr.P]

I see you are now on to high speed filament compression testing (to go along with your tension tests I assume)!  Maybe you can sell the idea gamo… for their “fps” specs


Nice work

[rsterne]

More like less than an inch.... over 800 lbs.... The area is 0.1 CI, so about 8000 psi compression....

Bob

[rsterne]

Point blank into soap as requested.... Came completely apart.... Shot to the left is "typical" HP slug (caliber unknown)....



Let's just say I wouldn't want to get hit by that at close range.... Short range pesting, anyone?.... 

Bob

[WhatUPSbox?]

Well, I was goin to suggest that a BB in the tip would help it expand, but Wow, never mind.

[rsterne]

Penetration about an inch, the biggest fragment of the one I dug out after taking the photo was about 1/4 of the skirt.... Only others were a few tiny fragments.... I guess most of it went sideways on impact.... Using 100% infill (no internal voids) they might stay together better?....

Bob

[WhatUPSbox?]

I hope the PLA doesn't foul the rifling.

[rsterne]

6 shots is all I'm planning.... I haven't checked the rifling yet, but I will....

Maybe I could use carbon fibre filled filament to polish the bore?.... 

Bob