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All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Engineering- Research & Development => Topic started by: pedersondev on September 08, 2016, 04:00:10 AM

Title: Pellet Box Magazines
Post by: pedersondev on September 08, 2016, 04:00:10 AM

I know most air rifles don't use spring-loaded box magazines for pellets since the spring will deform the pellet skirts. 

I decided to try anyways with a double stack 3D printed test magazine. 

Here's the results after leaving the pellets under tension for around 8 hours.  The spring I used had a spring rate of 0.76 lb/in.  The pellets are .22 Crosman brand I bought some time ago.  I chose them because I read that Crosman uses a special hardened lead alloy for their pellets. 


As far as I can tell, the only pellet with significant deformation was the one at the very top in contact with the ramp. 
The magazine will not feed since I made the taper leading to the "mouth" too short.

Title: Re: Pellet Box Magazines
Post by: pedersondev on September 08, 2016, 04:01:25 AM

Here are pictures of the box in use. 

Title: Re: Pellet Box Magazines
Post by: AmBraCol on September 08, 2016, 08:37:16 AM

That's interesting.  What rifle is it for?

Title: Re: Pellet Box Magazines
Post by: pedersondev on September 08, 2016, 10:08:21 PM

Quote from: AmBraCol on September 08, 2016, 08:37:16 AM

That's interesting.  What rifle is it for?

It's not for any particular rifle.  It was a test to see if it was possible to make a spring-loaded box magazine that won't damage the pellets. 

Title: Re: Pellet Box Magazines
Post by: AmBraCol on September 08, 2016, 11:09:29 PM

Gotcha. I'll quit hurting my head trying to figure it out.   ;D Proof of concept, not prototype.