.300 whisper crimp die?

[snowhack]

I'm new to the site. Howdy. Pretty nice site.

I'm getting into .300 Whisper and reloading it. I got the Redding two die set. I'm making brass from once fired .223s. Its going through a semi-auto (AR-15) so I need to crimp the bullets in. I can't find a crimp die. I'm guessing I may be able to use a 7.62x39 crimp die, but I don't want to buy it until I know for sure. Will it work or is there a specific die for this cal.? Thanks.