one foot in the wildcats den

[mapper]

You can get a little more room for seating (0.030 or so) in metal ar mags as they are thinner.

Sharps load data.
http://srcarms.com/wordpress/wp-cont...ading-Data.pdf


Mongoose data
https://docs.google.com/spreadsheets...diY9A/htmlview

I'm not knocking any other caliber, as there are lots of choices.
But component cost and availibility,brass forming procedure, powder and bullet selection, magazine limitations and seating depth, case capacity, all have considerations. Some more than others.

Both of these are variations of 6x45
I have just stuck my toe in the wildcat den,
Others have far more knowledge than me, but I wanted to learn.