09 September 2015

Feed

Found something kind of interesting.

The Star B has many fewer misfeeds when fed Federal aluminum cased ammo (CAL9115).

I've read that the original magazine design assumed that the cartridges would be steel cased.

Brass has a lot higher lubriscosity against steel than steel has against itself.

This might explain why the rounds are nearly self-launching from the magazine when using brass cases.  If they're designed to be reliable with "sticky" steel cases, they're likely to not hold the "slippy" brass tightly enough.

The aluminum cases are stickier than brass, and work better.

Go figure.

I should test with some sort of steel case now.  It'd be odd if the polymer coatings make them act too much like brass, huh?

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