Alliant Blue Dot or Alliant 2400. Blue Dot would be my preferred choice but supplies can be iffy as it's not that popular.
Gallery loads in special cases with a 158gn bullet around a sedate 800fps. 110gn fast and flat with maximum loads in magnum cases of around 1475fps and 140gn bullets around 1300fps with maximum. As the data uses a 4" barrelled universal reciever, you'll get a wee bit faster with the hotter loads and a carbine barrel length.
As an aside, if you also find yourself in a position where you want to load specialised shotgun ammo with shot or slug, Blue Dot is also a great powder for that.
You're going to need to get to over 1900fps with the 140gns to make 1000 f/lbs though.