Ranger -in the Harvester Crush Rib (CR) sabot the green is for 44 cal (.429" - .430")bullets and the black is for 45 cal bullets (.451"-.452").
That being said, I agree with Chap in that the 300 gr would be a better choice. You may get a bit more velocity with the 240 gr but the 300, at least in 2 of my rifles, is more accurate. (and packs a harder wallop).
A few of us use the .430" 300 gr XPT and a green CR sabot with good success.