5.7x28mm boolit recommendation?

[troy_mclure]

i just picked up a 5.7x28 ar upper.

im thinking of casting for it.

what .224 boolit and lube(no lube sizer so pan or tumble only) would be best?

im thinking 30gr @ 2400fps to 40gr @ 2000fps.

what are your thoughts and ideas?

[NSP64]

Isn't the action a blowback design? What is the twist rate ?

[NoZombies]

Light .22 molds are hard to find. If you can find a lyman 225-450 it's only about 45 grains, and is very pointy. the 225-438 is about the same weight, but a lot shorter and round nosed. The 225-438 is a current catalog item, most every other currently made and frequently available mold is 55 grains and up. The ranch dog mold is only about 50 though, and is a great price point!

The short 5.7 neck length isn't real good for cast either. Sadly the cartridge just aint great for cast in it's current form.

[troy_mclure]

Isn't the action a blowback design? What is the twist rate ?

yes its blowback, 1/8.5 twist.