I'm using 25gr, which I swear was found in load data but everywhere I've looked is saying max is around 24gr... so use at your own risk. Out of my 18" barrel I'm getting 2700 fps, which is absolutely perfect. No pressure signs on the brass or primers.
Yes, I made an account specifically to reply to you. The trick is to finding the right powder for this bullet. I couldn't get very good accuracy out of my fn 18" barrel with this bullet and varget, but I tried staball match and achieved this group, 100 yards.