BCSheephunter
I have also tried VV N550 and was very dissapointed with it..velocities were well below those achieved with H4350...ps I use Federal 215 on these loads... I would like to try some Magpro since it seems to fill up the case nicely and published velocities seem to be right up to if not exceed H4350. I understand it is not possible to exceed the 150 grain Silvertip published velocity or even match them with current powder out there. There is a rumour that Winchester used Magpro to get those velocities. I was getting 3294 out of the A bolt and 3306 with the Model 70 with factory 150 Silver Ballistictip ammo ....temperature was in the mid 70's . YOur going to have to pretty much stay at 2.860 OAL with the browning..you can seat it off .020 with the Model 70. It helped the Winchester shoot better but made no difference with the A bolt.
