450Bushmaster.net

There's a "big bore" speed loader from Chamber Tactical...I'm going to try one and see.,..$9.50

http://www.chambertactical.com/product/ ... ed-loader/


They also have followers for making higher capacity 450b mags out of standard 5.56 mags...

http://www.chambertactical.com/

https://www.youtube.com/watch?v=Vp3E7lf-WJw

...pretty cheap, too...

Here's another variation for speed loading:

https://www.sportsmansguide.com/product ... k?a=427177