I ran some 100yd groups today through the Pro Hunter w/ Encore Bergara barrel using some Barnes .451 250gr 454 Casull XPB pistol bullets. Targets show 100 and 110gr charges. On the 110gr target I flinched on shot 3, hence the high one. A 4th was shot and dropped right into the group. Bullets weighed 250gr before I shot them and the two I dug out of the dirt mound weighed 250gr also. 100% weight retention! The only difference I can see by looking at a Barnes XPB pistol bullet and a Barnes MZ is the XPB has a cannalure around it. Sorry about the picture quality, I am no photographer!