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Fair enough.
If cast bullets and 223 bolt face are set in stone for you then 30 apache would be the way to go IMO.

Whats the appeal of using cast bullets? Just for the cost saving?
I briefly played with case bullets and found them to be a pain in the arse when loading, that unless I was a very high volume...

In your situation then it probably is a fairly good choice, certainly will have more oomph that a 300blk with supers.

If you are hunting at fairly close distances then there's probably little...

Not sure why you'd bother with this cartridge if you weren't using it in an AR15.
The appeal to 300blk is the ability to use both subs and supers, if you aren't going to use subs then there are...