I got some information for the 180 grain bullet using 2400 @ 10.5 at max i think. I got the load right out of the book from accurate powders i think.. i know its on the site also.. anyway i tried to load this and my bullet would not seat because of the powder. well im going to call them. 3 other reloaders also viewed this happening. so i ended up completly not using the 2400 and got some unique off my uncle. i shot 100 rounds of 180 grain hornady xtp they shot very nice! even a llittle under 50 yards they shot nice. put it this way the police use this weapon around my area and i wouldnt want to be a criminal gettin shot at with the 40