Pressure has to build up as the powder burns,gases push the bullet out through the barrel,Bart and Grumpyone know more on this then I do.. I load nosler 185gr bullet with 9.0gr Aliants Power pistol, it works and measures well.(Nosler & Hornady have been compared to each other.) Nosler in my opinion work better as far as accuracy oal @1.175 as for the 185xtp mushrooms out way better then nosler hp.. I hope this has been of some good use? 1.175 and what ever powder you go with go with the starting load and work your way up, check for signs of high pressure! Make a few rounds at a time so you won't have to pull any! A 230gr hornady XTP/HP is more accurate bullet then the 185gr xtp again in my opinion its more versatile and has more knock down power then the 185gr bullet it is mostly used for target practice, well Good luck!