what powder does Remington use for 300bk?

[Stoney]

I pulled the bullets of a couple of their 220gr sub rounds and it was about 10.2gr of something, reload it into a x39 and it fired and lock the bolt back on the mag OK. Would like to make some sub rounds for the x39.

[CMV]

Re: what powder does Remington use for 300bk?

You can't buy what the manufacturers use. They don't always use the exact same thing either. They buy huge bulk lots, test burn rate, and adjust to compensate.

A1680 works well with 220gr. I'd try that.