Thread: 6.5 PRC Quickload info needed if possible.

Not the exact answer to your question but the powder should be the same variability as a batch change... hard to quantity without actually firing and comparing velocity to old batch.

You could compare water capacity of the two types of brass and use that as a base to make a percentage change.

If it was me tho I'd just drop down a grain or so and work back up and see where I ended up!