So far US869 seems to work very well in my 264 Mag.I have not done much shooting with that powder but what little I have done looks very promising.I shot one group at 600 yards that went inside 6 inches with Remington 140 gr Corelock Untrabonded bullets and 76 gr US869.Remington 700 CDL with a 26 in Fluted Barrel.I have not had the opportunity to chrono these loads yet.